Visualization Abrikosovs Vortices by Decoration Method in Novel Superconductors L.Ya. VinnikovL.A, Emelchenko ISSP RAS, Chernogolovka, RUSSIA F.L. Barkov J.Karpinskii ETH-Zurich, SWITZERLAND S.M.KazakovJ. Jun J.Anderegg AMESLAB,ISU, AMES, USAS.L.Budko P.C.CanfieldV.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 alPinning 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 alPinning 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 alPinning 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 alPinning 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 GsThe right insert is the Fourier transform, the left one autocorrelation pattern

LuNi2B2CV3SiAnisotropy in the long-range orderPRB (2000)

RHOMBIC -TOSQUARE VORTEX LATTICE TRANSITION LuNi2B2CV3SiPRB (2000)

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

Vortex Structure in ErNi2B2CH=8 Oe, Td=5.5K

Vortex Structure in HoNi2B2CH= 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

SUMMARYThe 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

Add pictures vortex pinning for YBCO123 by twin boundaries Add data V3Si ?The direct evidence for magnetic nature of the pinning by twin boundaries in RNi2B2C R=Er (at least partial)