Thursday, April 25, 2013

1304.6509 (Yoichi Higashi et al.)

Field-angle Resolved Flux-flow Resistivity as a Phase-sensitive Probe of
Unconventional Cooper Pairing

Yoichi Higashi, Yuki Nagai, Masahiko Machida, Nobuhiko Hayashi
We theoretically investigate the applied magnetic field-angle dependence of the flux-flow resistivity $\rho_{\rm f}(\alpha_{\rm M})$ for an uniaxially anisotropic Fermi surface. $\rho_{\rm f}$ is related to the quasiparticle scattering rate $\varGamma$ inside a vortex core, which reflects the sign change in the superconducting pair potential. We find that $\rho_{\rm f}(\alpha_{\rm M})$ is sensitive to the sign-change in the pair potential and has its maximum when the magnetic field is parallel to the gap-node direction. We propose the measurement of the field-angle dependent oscillation of $\rho_{\rm f}(\alpha_{\rm M})$ as a phase-sensitive field-angle resolved experiment.
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