Flux-Flow Resistivity Anisotropy in the Instability Regime of the a−b Plane of Epitaxial Superconducting YBa2Cu3O7−δ Thin Films
B. Kalisky, P. Aronov, G. Koren, A. Shaulov, Y. Yeshurun, R. P. Huebener
DOI 10.1103/PhysRevLett.97.067003 · Physical Review Letters
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Abstract
Measurements of the nonlinear flux-flow resistivity ρ and the critical vortex velocity vφ* at high voltage bias close to the instability regime predicted by Larkin and Ovchinnikov (Z. Eksp. Teor. Fiz 68, 1915 (1975) [Sov. Phys. JETP 41, 960 (1976)]) are reported along the node and antinode directions of the d-wave order parameter in the a−b plane of epitaxial YBa2Cu3O7−δ films. In this pinning-free regime, ρ and vφ* are found to be anisotropic with values in the node direction larger on average by 10% than in the antinode direction. The anisotropy of ρ is almost independent of temperature and field. We attribute the observed results to the anisotropic quasiparticle distribution on the Fermi surface of YBa2Cu3O7−δ.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 94 | Pressure not reported | onset |
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