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Flux-flow resistivity anisotropy in the instability regime in the a-b plane of epitaxial YBCO thin films | | B. Kalisky
; P. Aronov
; G. Koren
; A. Shaulov
; Y. Yeshurun
; R. P. Huebener
; | | Date: |
26 Jun 2006 | | Subject: | Superconductivity; Strongly Correlated Electrons | | Abstract: | Measurements of the nonlinear flux-flow resistivity $
ho$ and the critical vortex velocity $
m v^*_phi$ at high voltage bias close to the instability regime predicted by Larkin and Ovchinnikov cite{LO} are reported along the node and antinode directions of the d-wave order parameter in the extit{a-b} plane of epitaxial $YBa_2Cu_3O_{7-delta}$ films. In this pinning-free regime, $
ho$ and $
m v^*_phi$ are found to be anisotropic with values in the node direction larger on average by 10% than in the antinode direction. The anisotropy of $
ho$ is almost independent of temperature and field. We attribute the observed results to the anisotropic quasiparticle distribution on the Fermi surface of $YBa_2Cu_3O_{7-delta}$. | | Source: | arXiv, cond-mat/0606667 | | Services: | Forum | Review | PDF | Favorites | |
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