Science and Technology ofThin Film Superconductors 2

Science and Technology of Thin FillD Superconductors 2 Edited by Robert D. McConnell and Rommel Noufi Solar Energy Research Institute Golden, Colorado

Plenum Press • New York and London

Lbrary of Congress Cataloging in Publication Data

Conference on the Science and Technology of Thin Film Superconductors (2nd: 1990: Denver, Colo.) Science and technology of thin film superconductors 2 / edited by Roben D.

McConnell and Rommel Noufi. p. cm.

"Proceedings of the Second Conference on the Science and Technology of Thin Film Superconductors, held April 30-May 4,1990, Denver, Colorado" - Verso t.p.

Includes bibliographical references and index. ISBN 978-1-4684-1347-2 ISBN 978-1-4684-1345-8 (eBook) DOI 10.1007/978-1-4684-1345-8 I. Superconductors-Congresses. 2. Thin film devices-Congresses. I. McConnell ,

Roben D. II. Noufi , Rommel. III. Tide. TK7872.S8C67 1990 621.3-dc20 90-21503

Proceedings of the Second Conference on the Science .and Technology of Thin Film Superconductors, held April 30-May 4, 1990, . in Denver , Colorado

© 1990 Plenum Press, New York Softcover reprint of the hardcover 1st edition 1990 A Division of Plenum Publishing Corporation 233 Spring Street, New York, N.Y. 10013

All rights reserved

CIP

No part of this book may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, photocopying, microfilming, recording, or otherwise, without written permission from the Publisher

PROGRAM COMMITIEE

R. McConnell, Solar Energy Research Institute R. Berdahl, Lawrence Berkeley Laboratory R. Blaugher, Intermagnetics General Corp. R. Eaton, U.S. Department of Energy 1. Halbritter, Kernforschungszenttum, Karlsruhe R. Hammond, Stanford University R. Harris, National Institute of Standards and Technology A. Hermann, University of Colorado R. Noufi, Solar Energy Research Institute R. Simon, TRW, Inc. K. Wasa, Matsushita Electric Industrial Co., Ltd. S. Wolf, Naval Research Laboratory

CONFERENCE ORGANIZERS

U.S. Department of Energy Solar Energy Research Institute

CONFERENCE COORDINATOR

D. Christodaro, Solar Energy Research Institute

PROCEEDINGS

R. McConnell, Solar Energy Research Institute R. Noufi, Solar Energy Research Institute

v

PREFACE

This conference is the second on the Science and Technology of Thin Film Superconductors. It proved to be an excellent forum for these specialists in thin film superconductivity. The conference, held April 30-May 4, 1990, in Denver, Colorado, hosted 170 researchers from 17 countries.

The response to the conference again emphasized the need for a meeting devoted to the science and technology of thin film superconductors. The breadth of artic1es and advances made in this technology since the first conference in November 1988, reflect on the maturity of the topic. These proceedings contain artic1es on deposition methods by sputtering, e1ectron beam evaporation, resistive evaporation, laser ablation, chemical vapor deposition and electrodeposition, and on other studies related to substrates, thermodynamics of formation, grain boundaries and weak links, characterization, and some practical applications. The program committee was pleased with the quality of the publications and contributed articles.

This conference was highlighted by a fuU day dedicated to presentations from the federallaboratories, discussing a wide range of topics on the fabrication, characterization, and theory of high-temperature superconductor thin films. Other highlights at the conference dealt with (1) critical parameters or problems in measuring critical current density and other important parameters, and (2) problems of scale-up, reproducibility, and amenability to device fabrication. It became evident from the presentations that three issues were developing into critical issues for the ultimate practical application of high­temperature superconductor thin films. (1) Weak links in polycrysta1line thin films affect the levels of the critical current available and result in a rapid decrease in critical current in the presence of magnetic fields. Texturing the films was shown as one way to improve the linking behavior. (2) The best high-temperature superconducting thin films are grown epitaxiallyon single-crystal substrates, which are not appropriate for practical applications. The challenge is to maintain the high-temperature qualities on practical polycrystalline substrates in such forms as foils, tapes, ribbons, and wires. Metal organic chemical vapor deposition (MOCVD), electrodeposition, and sputtering processes have demonstrated some progress toward this goal. (3) Processing issues, such as large area, cost, and high deposition rate, were also discussed as important factors in thin film applications to device fabrication.

Many people and organizations are responsible for the success of the conference. We thank the Solar Energy Research Institute and the V.S. Department of Energy's Office of Energy Storage and Distribution for their support. We thank the program committee who identified so many excellent researchers to participate (a special thanks to Stuart Wolf).

vii

Again, Diane Christodaro from the Solar Energy Research Institute skillfully coordinated preparations for the conference. She and the members of her group ensured a smooth flow of the scheduled activities, and resolved individual attendees' problems. We thank the many contributors who took the time and effort to prepare high-quality presentations of their research and participate in dialogue with their peers.

R. D. McConnell and R. Noufi

viii

CON1ENTS

SPUITERING

Cathodic Sputtering as a Tool for the High-Tc Superconducting Materials Processing

K. Wasa, H. Adachi, Y. Ichikawa, K. Hirochi, T. Matsushima, A. Enokihara, K. Mizuno, H. Higashino, and K. Setsune ................................ 1

Properties of Epitaxial YB~Cu307/PrB~Cu307 Heterostructures Sputtered at High Oxygen Pressures

H. Soltner, B. Kabius, C. L. Jia, P. Prieto, U. Poppe, J. Schubert, and Ch. Buchal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

Superconducting Properties of YB~Cu307/PrB~Cu307 Superlattices J.-M. Triscone, O. Fischer, L. Antognazza, O. Brunner, A. D. Kent, L. Mieville, and M. G. Karkut ....................... 13

Factors Affecting Formation of In Situ and 110 K Phase Sputtered Bi-Based Superconducting Thin Films

N. G. Dhere . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

In-Situ Growth of Superconducting Films of Bi-Sr-Ca-Cu-O Using Magnetron Sputtering

R. T. Kampwirth, J. M. Grace, D. J. Miller, D. B. McDonald, K. E. Gray, P. H. Andersen, B. Driehuys, M. Reiten, and M. Ascolese . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39

Highly-Textured Tl-Ba-Ca-Cu-O Polycrystalline Superconducting Films on Ag Substrates

P. Arendt, N. Elliott, D. W. Cooke, R. Dye, E. Gray, K. Hubbard, J. Martin, G. Reeves, D. Brown, and A. Klapetzky ......................................... 47

YBCO and LSCO Films Grown by Off-Axis Sputtering J. Talvacchio, M. G. Forrester, J. R. Gavaler, and T. T. Braggins ........................................... 57

ix

Thin Films of Y 1 Ba2Cu307_~ Prepared by 3-Target Co-Sputtering L. H. Allen, E. J. Cukauskas, and P. K. Van Damme ................ 67

Compositional Modifications in Target and Sputtered Y-Ba-Cu-O Films on Annealing

D. K. Aswal, S. C. Karandikar, S. K. Gupta, S. C. Sabharwal, L. C. Gupta, and M. K. Gupta . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75

Control of Thickness and Composition Uniformity in Sputtered Superconducting Thin Films

N. G. Dhere and M. S. Khare ................................ 85

Growth Analysis and Properties of Sputter-Deposited YBaCuO Thin Films

J. Geerk, Q. Li, G. Linker, 0. Meyer, F. Ratzei, J. Remmel, W. Schauer, R. Smithey, F. Vassenden, and X. X. Xi . . . . . . . . . . . . . . . . 91

Reproducible Fabrication of YB~Cu306+~ Thin Films by DC Magnetron Sputtering

G. Larsson, T. I. Selinder, U. Helmersson, and S. Rudner . . . . . . . . . . . . . 93

High Tc YBa2Cu307_x and T1mC~Ba2Cun+10x Thin Films by Sputter Deposition from Stoichiometric Oxide Targets

W. Y. Lee, J. Salem, V. Y. Lee, T. C. Huang, V. Deline, and R. Savoy . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 101

In Situ Epitaxial Growth of the Gd-Ba-Cu-O Superconducting Thin Films on (100) LaA103 by DC-Magnetron Spuuering Using Single Planar Target

H. C. Li, H. R. Yi, R. L. Wang, G. N. Zhou, Y. Chen, B. Yin, X. S. Ron, S. F. Cui, D. S. Dai, and L. Li .. . . . . . . . . . . . . . . . . 103

In-Situ Growth of Y-Ba-Cu-O Films by High Pressure DC Sputtering R. J. Lin and P. T. Wu ..................................... 109

Growth of YBaCuO Superconducting Thin Films by Hollow Cathode Magnetron Sputtering

R. Pinto, P. R. Apte, A. G. Chourey, and V. S. Shirodkar . . . . . . . . . . . . . 119

Deposition of YBa2Cu307 Films on Sapphire by RF Triode Sputtering

R. E. Soltis, E. M. Logothetis, D. W. Hoffman, J. W. Hangas, S. Shinozaki, M. Aslam, L. E. Wenger, and J. T. Chen .............................................. 125

The Growth and Characterization of Pb-Doped Bi-Sr-Ca-Cu-O Thin Films

M. R. Tseng, 1. 1. Chu, Y. T. Huang, W. N. Wang, and P. T. Wu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 131

x

In-Situ Epitaxial Growth of High Tc RBa2Cu307 Thin Films on SrTi03, MgO and y-zr02 Substrates

S. Wang and G. Xiong ..................................... 139

Growth of YBCO Superconducting Thin Films by Magnetron Spuuering S. Yang, P. Wu, Z. Ji, Z. Sun, Y. Li, S. Zhang, G. Wang, H. Zhang, and H. Liu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 145

Preparation of Bi(Pb)-Sr-Ca-Cu-O Thin Films with Tc (Zero) at Above lOOK

P. Zhou, Z. Dong, G. Liu, Q. Yang, and Z. Zhao . . . . . . . . . . . . . . . . . . . 147

LASER DEPOSmON

High Tc Superconducting Layered Structures and Superlattices Q. Li and T. Venkatesan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153

Preparation and Properties of Laser Deposited High Tc Films L. Schultz .............................................. 155

YB~Cu307_x Thin Film Growth on Single Crystal and Polycrystalline Yttria-Stabilized Zirconia

D. P. Norton, D. H. Lowndes, D. K. Christen, E. C. Jones, J. D. Budai, T. D. Ketcham, D. St. Julien, K. W. Lay, and J. E. Tkaczyk . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

Modern Laser Technology of Deposition, Diagnostics and Topology Formation of Y-Ba-Cu-O Thin-Film Superconductors

V. Cherny, A. Pospeloff, V. Dneprovsky, and E. Kaydashev ......... . . 167

In Situ YBCO Thin Films Made by Laser Deposition G. Brorsson, Z. Ivanov, and p-A Nilsson . . . . . . . . . . . . . . . . . . . . . . . . . 169

Electrical and Magnetic Analysis of YB~Cu307_x Superconducting Films Grown by Laser Ablation

D. W. Chung, T. L. Peterson, R. Fletcher, P. M. Hemenger, I. Maartense, and P. T. Murray ............................... 177

YBCO Films and YSZ Buffer Layers Grown In Situ on Silicon by Pulsed Laser Deposition

D. K. Fork, G. A. N. Connell, D. B. Fenner, J. B. Boyce, J. M. Phillips, and T. H. Geballe .............................. 187

In-Situ Deposited Superconducting Laser Ablated Thin Films of

Y 1 B~Cu30x and BiO.8PbO.2SrO.8Cal Cu 1. 60 x T. Frey, St. Siegmann, H.-J. Güntherodt, L. Drabeck, G. Grüner, U. Ebels and C. Quittman ...... . . . . . . . . . . . . . . . . . . . . . 197

xi

Pulsed Laser Deposition of Tl-Ca-Ba-Cu-O Films at 248 nm N. J. lanno, D. Thompson, B. Johs, S. H. Liou, and J. A. Woollam . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205

Superconductivity in Single Unit Cell YBa2Cu307_x Layers in YB~Cu307 _xfPrBa2Cu307 -x Superlattices

D. P. Norton, D. H. Lowndes, J. D. Budai, S. J. Pennycook, B. C. Sales, and D. K. Christen ............................... 215

NEW AND DIFFERENT GROWTH TECHNIQUES

Low Temperature Fabrication of YBa2Cu307_x High-Tc Superconducting Thin Films by Plasma-Enhanced Metalorganic Chemical Vapor Deposition

J. Zhao, D. W. Noh, C. S. Chern, Y. Q. Li, P. Norris, B. Gallois, and B. Kear . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 217

Preparation and Physical Properties of Bi-Sr-Ca-Cu-O Films Grown by Molecular Beam Epitaxy U sing Pure Ozone

K. Uchinokura, Y. Nakayama, I. Tsukada, I. Terasaki, and A. Maeda ........................................... 223

Formation of Passivation Films on High-Tc Superconducting Thin Films by Plasma Processing

T. Hirao, T. Kamada, S. Hayashi, M. Kitagawa, and K. Wasa ............................................... 233

Superconductor Thin Films Via an Electrodeposition Process R. N. Bhattacharya, R. Noufi, L. L. Roybal, R. K. Ahrenkiel, P. Parilla, A. Mason, and D. Albin . . . . . . . . . . . . . . . . . 243

Improved Tl-Ca-Ba-Cu-O Thin-Film Superconductors A. M. Hermann, H. Duan, F. Ararnmash, R. J. Deck, D. Marsh, W. Kiehl, M. J. Saeed, J. Tang, D. L. Viar, P. S. Wang, and D. G. Naugle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 251

Preparation Study of Bi-Sr-Ca-Cu-Oxides Superconducting Thin Films by Resistive Evaporation

J.Azoulay, L. R. Tessler, and G. Deutscher. . . . . . . . . . . . . . . . . . . . . . . 261

A Radio-Frequency Glow Discharge Ion Gun far Preparation of High Tc Oxide Superconductor Surfaces

R. C. Budhani, M. W. Ruckman, and S. L. Qiu .. . . . . . . . . . . . . . . . . . . 265

In-Situ Growth of Superconducting Single Crystal Bi-Sr-Ca-Cu-O Thin Films by Molecular Beam Epitaxy

I. Bozovic, J. N. Eckstein, D. G. Schlom, and J. S. Harris . . . . . . . . . . . . . 267

xii

Preparation of YBaCuO Films by e-Beam Evaporation and the Effect of Hydrogen Charging on the Electrical Transport Properties

J. Erxmeyer, A. Balogh, G. Dortmann, J. Steiger, O. Boebel, and A. Weidinger . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 273

High-Temperature Superconducting Films Prepared by Low-Pressure RF-Plasma Deposition

H. Jaeger, K. Schulze, and H. Frey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 279

Single Source Electron Beam Evaporation of Bi-Sr-Ca-Cu-O Thin Films

M. G. Krishna, G. K. Muralidhar, G. M. Rao, K. N. Rao, and S. Mohan ........................................... 289

Preparation of Superconducting Tl-Ba-Ca-Cu-O Films by Diffusion Method

D. H. Kuo, R. J. Lin, and P. T. Wu ............................ 291

Sandwich Tunnel Junction with DyBaCuO Grown by Molecular Beam Atomic Layer Epitaxy

A. Schuhl, R. Cabanel, B. Ghyselen, and G. Creuzet ................ 301

Y-Ba-Cu-O Superconducting Thin Films Deposited by Rapid Isothermal Processing MOCVD

R. Singh, S. Sinha, N. J. Hsu, J. T. C. Ng, P. Chou, H. S. UUal, A. J. Nelson, and A. B. Swartzlander . . . . . . . . . . . . . . . . . . . 303

Superconducting YIBa2Cu307_~ Films by RF Plasma Aerosol Evaporation at Atmospheric Pressure

X. W. Wang, H. H. Zhong, and R. L. Snyder ..................... 311

CHARACTERIZA TION

Grain Structure and Grain Boundaries in High Tc Superconducting YB~Cu307_x Thin Films

D. H. Shin, J. Silcox, S. E. Russek, D. K. Lathrop, B. Moeckly, and R. A. Buhrman .............................. 319

Characterization of the Surface of Oxide Superconductors H. Ihara, T. Shimomura, N. Terada, and M. Jo .................... 329

Weak Link Properties of YBa2Cu307_~ Thin Film Grain Boundaries S. E. Russek, D. K. Lathrop, B. H. Moeckly, R. A. Buhrman, D. H. Shin, and J. Silcox . . . . . . . . . . . . . . . . . . . . . . . . 331

Microstructures of Superconducting YBa2Cu307_x Thin Films S. N. Basu, T. Roy, T. E. MitcheU, R. E. Muenchausen, and M. N astasi . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 341

xiii

In-Situ Rheed Studies of Initial Growth Stages of YBCO-Films by Thennal Co-Evaporation

F. Baudenbacher, H. Karl, P. Berberich, and H. Kinder. . . . . . . . . . . . . . . 351

Superconducting Properties of YBa2Cu307_x Thin Films by Plasma Enhanced Metal Organic Chemical Vapor Deposition

C. S. Chern, J. Zhao, Y. Q. Li, H. Du, P. Norris, B. Kear, and B. Gallois . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 359

In Situ Preparation and Surface Investigations of Y IB~Cu307_x' Bi2CalSr2Cu20x and Nd1.85CeO.15Cu04_x HTSC Films

V. A. Gasparov, V. V. Bondarev, A. F. Dite, and S. S. Khasanov . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 367

Relationship of Microstructures in YBa2Cu307_x with Growth Conditions and Superconducting Properties

K. P. Mingard, L. T. Romano, C. R. M. Grovenor, and B. Cantor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 369

Microstructure Development in Thin-Film Superconductors M. G. Norton, C. B. Carter, B. H. Moeckly, S. E. Russek, and R. A. Buhnnan . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 379

Characterization of RF-Sputtered Lanthanum Aluminate Thin Films C. Poirot, J. Trefny, B. Yarar, J. Ahn, P. Michael, L. Greco, N. Wada, P. Ahrenkiel, C. Platt, and A. Lee . . . . . . . . . . . . . . . 389.

SUPERCONDUCTORPROPERTIES

Correlation Between Insitu Growth Conditions and Thennodynamic Stability Criteria for Y 1 Ba2Cu30y

R. H. Hammond, V. Matijasevic, and R. Bonnann ., . . . . . . . . . . . . . . . . 395

YBa2Cu307_x Thin Films: Some Problems of Synthesis and Ways to Solve Them

A. R. Kaul, I. E. Korsakov, and A. V. Pennjakov .................. 403

Electron Tunneling Into Thin Films of YBa2Cu307 J. M. Valles, Jr. .......................................... 413

Infrared Studies of Laser-Deposited High-Tc Films D. B. Tanner, N. Tache, S. L. Herr, K. Kamaras, C. D. Porter, D. B. Romero, S. Etemad, T. Venkatesan, B. Dutta, A. Inam, and X. D. Wu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 415

Correlation of Normal and Superconducting Properties and Unified Approach in the Theory of High Tc

V. Kresin, M. Morawitz, and S. Wolf. . . . . . . . . . . . . . . . . . . . . . . . . . . 417

xiv

Magnetic Field Induced Broadening of the Resistive Transition in Epitaxial Films of YBa2Cu307 and Y 2Ba4Cu8016

R. C. Budhani, M. Suenaga, and D. 0. Welch . . . . . . . . . . . . . . . . . . . . . 419

Novel Procedure for Mapping the Jc-HcTTc Surface and Its Application to High Temperature Superconductors

J. Moreland, Y. K. Li, L. F. Goodrich, A. Roshko, and R. H. Ono .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 429

Flux Motion Effects in Tl-Ca-Ba-Cu-O Thin Films C. P. Tigges, E. L. Venturini, D. S. Ginley, J. F. Kwak, B. Morosin, 1. C. Barbour, R. J. Baughman, R. P. Hellmer, T. E. Zipperian, and J. S. Martens ............................. 439

Photoresistive Response of Superconducting Thin Films U. Strom, J. C. Culbertson, and S. A. Wolf. . . . . . . . . . . . . . . . . . . . . . . 449

Critical Current in High Magnetic Field of Y-Ba-Cu Oxide Films Prepared by CVD Method

Y. Muto, K. Watanabe, N. Kobayashi, H. Yamane, and T. Hirai . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 459

Correlation of Thermoelectric Power, Meissner Effect and Oxygen Content of YBa2Cu307_x High Tc Superconductors

I. A. Cornejo, 1. H. Ahn, J. U. Trefny, B. Yarar, R. Hu, and C. Platt . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 469

Measurement of Some Electrical Properties of Arsenic Oxide Doped Thin Films of Gd1 Ba2Cu307_~

S. S. Dubey . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 477

RF Residual Losses, Surface Impedance and Granularity in Superconducting Cuprates

J. Halbritter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 479

Influence of Phase Fluctuations in Dynamical Magnetoconductance Measurements of Both Square and Fractal Wire Networks

B. Jeanneret, Ph. Flückiger, R. Meyer, J. L. Gavilano, Ch. Leemann, and P. Martinoli . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 481

Contacts to Bi-Sr-Ca-Cu Oxide Superconducting Thin Films T. S. Kalkur, R. Y. Kwor, and D. P. Bryne . . . . . . . . . . . . . . . . . . . . . . . 483

Effect of Short Coherence Length on the Critical Current P. Kumar, S. G. Mishra, and S. K. Yip . . . . . . . . . . . . . . . . . . . . . . . . . . 491

Thin Films of YBa2Cu307 on LaA103 A. Mogro-Campero, L. G. Turner, and D. W. Cooke 495

xv

Magnetoresistance Near Gd Neel Temperature in GdB~Cu30 Films

Y. Narahara, F. Nakamura, T. Tamura, T. Terashima, K. Iijima, K. Yamamoto, K. Hirata, Y. Bando, and Y. Ochiai . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 503

High Frequency Characteristics of 1-2-3 Films on MgO Substrates Grown by Activated Reactive Evaporation

S. Prakash, K. Chou, G. Potwin, C. V. Deshpandey, H. J. Doerr, and R. F. Bunshah ............................... 511

Mutual Inductance of Thin Film Pb-Bi-Sr-Ca-Cu-O Films L. L. Roybal, R. N. Bhattacharya, M. Vickery, R. Noufi, R. Ahrenkiel, and J. Halbritter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 515

Transient Thermoelectric Effect and Carrier Dynarnics of YB~Cu307_~ Thin Films

M. Sasaki, M. Koyano, H. Negishi, and M. Inoue .................. 517

Transport Properties of High Temperature Superconducting Thin Films in Large Magnetic Fields

G. B. Srnith, J. M. Bell, S. W. Filipczuk, C. Andrikidis, and K-H. Muller. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 527

Orientation Dependence of Critical Currents in a-Axis Oriented YBCO Thin Films

X. K. Wang, D. X. Li, S. N. Song, J. Q. Zheng, R. P. H. Chang, and J. B. Ketterson .............. . . . . . . . . . . . . . . 535

Dependence of Millimeter Wave Surface Resistance on the Deposition Parameters of Laser Ablated YBa2Cu30x Thin Films

J. Wosik, T. Robin, M. Davis, J. C. Wolfe, K. Forster, S. Deshmukh, A. Bensaoula, R. Sega, D. Economou, and A. Ignatiev ............................................. 539

Supercurrent Tunnelling Between Conventional and Unconventional S uperconductors

S. K. Vip, O. Bonfim, and P. Kumar ........................... 547

APPLICA TIONS

Progress Towards a YBCO Circuit Process

xvi

R. W. Simon, J. F. Bureh, K. P. Daly, W. D. Dozier, R. Hu, A. E. Lee, J. A. Luine, H. M. Manasevit, C. E. Platt, S. M. Schwarzbek, D. St. John, M. S. Wire, and M. J. Zani . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 549

The Present Situation of High-Temperature Superconducting Thin Films for Electronic Devices

U. Kawabe ............................................. 561

Present Status and Future of dc SQUIDs Made from High-Tc S uperconductors

R. H. Koch, W. J. Gallagher, B. Oh, V. Foglietti, H. Olsson, R. B. Laibowitz, G. Koren, A. Gupta, and W. Y. Lee . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 563

Progress Towards Superconducting Electronics with High-Tc Thin Films

J. Clarke ............................................... 565

High-Tc Superconducting Infrared Detectors M. G. Forrester and J. Talvacchio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 567

Selective Heteroepitaxial Growth of MgOIYBaCuO System and Application to New Electronic Devices

T. Kobayashi, K. Sakuta, M. Iyori, U. Kabasawa, K. Asano, S. Hashiguchi, T. Awaji, and Y. Katayama . . . . . . . . . . . . . . . . 569

Stripline Resonators for Characterization of High-Tc Superconducting Films for Device Applications

D. E. Oates, A. C. Anderson, and P. M. Mankiewich

The NRL High Transition Temperature Superconductor Space Experiment (HTTSSE)

579

S. A. Wolf ............................................. 589

Planar Microwave High Tc Superconducting Circuit Testing and Ring Resonator Design

R. W. Babbit, T. E. Koscica, A. Rachlin, and E. Lenzing ............. 591

Optical Detection with YBCO Thin Films W. Eidelloth and F. S. Barnes ................................ 601

Submicron Lithography on YBCO Thin Films p-A Nilsson, E-K Andersson, G. Brorsson, and M. Danerud

Sequentially Evaporated Thin Film YBa2Cu307_x Superconducting Microwave Ring Resonator

N. J. Rohrer, H. Y. To, G. J. Valco, K. B. Bhasin,

607

C. Chorey, and J. Warner ................................... 615

Participants . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 625

Index. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 635

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