visualization abrikosov’s vortices by decoration method in novel superconductors l.ya. vinnikov...

Visualization Abrikosov’s Vortices by Decoration Method in Novel Superconductors

L.Ya. Vinnikov

L.A, Emelchenko ISSP RAS, Chernogolovka, RUSSIA

F.L. Barkov

J.Karpinskii ETH-Zurich, SWITZERLAND

S.M.Kazakov

J. Jun

J.Anderegg AMESLAB,ISU, AMES, USA

S.L.Budko

P.C.Canfield

V.Kogan

History(outline)

History (Outline)

HTS magnetic flux quantum YBCO 123 P.Gammel et al (1987)

L.Vinnikov et al (1988)

FLL Anisotropy (ab) YBCO 123 L.Vinnikov et al (1988)

Dolan et al (1989)

YBCO 124 L.Vinnikov, J.Karpinskii et al(1994)

Vortex Pinning by twin boundaries YBCO 123 L.Vinnikov et al (1988)

Dolan et al (1989)

Direct observation vortex pinning by columnar defect L.Vinnikov, G.Saemann-Ischenko et al(1993)

FLL in organic superconductors ET-CuNCS L.Vinnikov, N. Kushch et al (2000)

FLL in MgB2 L.Vinnikov, J.Karpinskii et al(2003)

Vortex lattice phase transitions (RNi2B2C) L.Vinnikov, S.Budko, P.Canfield, V.Kogan et al

Pinning vortices by magnetic twin boundaries (2000-2004)

History (Outline)

HTS magnetic flux quantum YBCO 123 P.Gammel et al (1987)

L.Vinnikov et al (1988)

FLL Anisotropy (ab) YBCO 123 L.Vinnikov et al (1988)

Dolan et al (1989)

YBCO 124 L.Vinnikov, J.Karpinskii et al(1994)

Vortex Pinning by twin boundaries YBCO 123 L.Vinnikov et al (1988)

Dolan et al (1989)

Direct observation vortex pinning by columnar defect L.Vinnikov, G.Saemann-Ischenko et al(1993)

FLL in organic superconductors ET-CuNCS L.Vinnikov, N. Kushch et al (2000)

FLL in MgB2 L.Vinnikov, J.Karpinskii et al(2003)

Vortex lattice phase transitions (RNi2B2C) L.Vinnikov, S.Budko, P.Canfield, V.Kogan et al

Pinning vortices by magnetic twin boundaries (2000-2004)

History (Outline)

HTS magnetic flux quantum YBCO 123 P.Gammel et al (1987)

L.Vinnikov et al (1988)

FLL Anisotropy (ab) YBCO 123 L.Vinnikov et al (1988)

Dolan et al (1989)

YBCO 124 L.Vinnikov, J.Karpinskii et al(1994)

Vortex Pinning by twin boundaries YBCO 123 L.Vinnikov et al (1988)

Dolan et al (1989)

Direct observation vortex pinning by columnar defect L.Vinnikov, G.Saemann-Ischenko et al(1993)

FLL in organic superconductors ET-CuNCS L.Vinnikov, N. Kushch et al (2000)

FLL in MgB2 L.Vinnikov, J.Karpinskii et al(2003)

Vortex lattice phase transitions (RNi2B2C) L.Vinnikov, S.Budko, P.Canfield, V.Kogan et al

Pinning vortices by magnetic twin boundaries (2000-2004)

History (Outline)

HTS magnetic flux quantum YBCO 123 P.Gammel et al (1987)

L.Vinnikov et al (1988)

FLL Anisotropy (ab) YBCO 123 L.Vinnikov et al (1988)

Dolan et al (1989)

YBCO 124 L.Vinnikov, J.Karpinskii et al(1994)

Vortex Pinning by twin boundaries YBCO 123 L.Vinnikov et al (1988)

Dolan et al (1989)

Direct observation vortex pinning by columnar defect L.Vinnikov, G.Saemann-Ischenko et al(1993)

FLL in organic superconductors ET-CuNCS L.Vinnikov, N. Kushch et al (2000)

FLL in MgB2 L.Vinnikov, J.Karpinskii et al(2003)

Vortex lattice phase transitions (RNi2B2C) L.Vinnikov, S.Budko, P.Canfield, V.Kogan et al

Pinning vortices by magnetic twin boundaries (2000-2004)

Anisotropy FLL in YBCO (ab) plane

YBCO 123 YBCO 124

Vortex pinning by twin boundaries in YBCO123

Flux Line Lattice destruction by columnar defects in BSCCO

Observation flux Line Lattice in the Organic Superconductors

Vortices in MgB2

The VL in LuNi2B2C for B=1840 Gs

The right insert is the Fourier transform, the left one autocorrelation pattern

LuNi2B2C V3Si

Anisotropy in the long-range order

PRB (2000)

RHOMBIC -TO–SQUARE VORTEX LATTICE TRANSITION

LuNi2B2C V3Si

PRB (2000)

N. Saha, R.Surdeanu, M.Marchevsky et al PRB (2000)

Vortex Structure in ErNi2B2C

H=8 Oe, Td=5.5K

Vortex Structure in HoNi2B2C

H= 17 Oe, Td= 4.3K

Magnetoelastic tetragonal-to-orthorhombic distortion for RNi2B2C

Magnetic structure for RNi2B2C

Superconducting and antiferromagnetic transition for RNi2B2C

Magnetic Flux Structure in TbNi2B2C

SUMMARY

The Bitter decoration provides a distinctive high-resolution technique for observation of anisotropy FLL, vortex pinning as well as antiferromagnetic domain in magnetic superconductors.  We have observed magnetic (vortex) structure for wide range magnetic fields and temperatures for superconducting and normal states for family RNi2B2C single crystals . We find the crystalographic ordered

vortex structures in HoNi2B2C and ErNi2B2C result from pinning by magnetic twin boundaries in

antiferromagnetic state.  The domain magnetic structure have revealed in AF state in TbNi2B2C for the first time by Bitter decoration

technique. Taking to account the symmetry of magnetoelastic distortions at AF transition in RNi2B2C we can predict

that for DyNi2B2C at temperatures less than TN should be observed structures similar observed here for

HoNi2B2C