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Multiterminal transport measurements: In-plane anisotropy and vortex liquid correlation in YBa2Cu3O7-delta
KTH, Superseded Departments, Microelectronics and Information Technology, IMIT.
2001 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 64, no 22Article in journal (Refereed) Published
Abstract [en]

Using a modified pseudoflux transformer geometry, the in-plane anisotropy and vortex-liquid correlation of an untwinned YBa2Cu3O7-delta single crystal have been studied. The square-shaped, multiterminal sample design allows comparative studies of a- and b-axis properties for arbitrarily oriented magnetic fields. We compare the in-plane resistivity in the case of intrinsic pinning with the longitudinal resistivity, i.e., with the resistivity in absence of a macroscopic Lorentz force. The relative ratio between resistivities rho (a) and rho (b) in the vortex state can be made to vary over a wide range by controlling the direction of the applied magnetic field. Evidence is found for almost isotropic fluctuations corresponding to a fluctuation anisotropy gamma (A)(ab)approximate to1.1, noted to be clearly lower than the anisotropy gamma (ab)=1.27 obtained from the vortex phase diagram.

Place, publisher, year, edition, pages
2001. Vol. 64, no 22
Keyword [en]
high-temperature superconductors, lattice melting transition, high-tc superconductors, single-crystals, untwinned yba2cu3o7-delta, monte-carlo, inplane anisotropy, ii superconductors, penetration depth, c superconductors
Identifiers
URN: urn:nbn:se:kth:diva-21175DOI: 10.1103/PhysRevB.64.224510ISI: 000172733300084OAI: oai:DiVA.org:kth-21175DiVA: diva2:339872
Note
QC 20100525Available from: 2010-08-10 Created: 2010-08-10 Last updated: 2017-12-12Bibliographically approved

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