Abstract
To study the anisotropic Josephson-vortex dynamics in the layered organic superconductor κ-(ET)2Cu(NCS)2, we intensively investigated the in-plane anisotropy of flux-flow resistivity in the non-Ohmic regime. Sharp peaks due to dissipative processes associated with the vortex dynamics were clearly observed in all in-plane magnetic field directions. The dependence of the flux-flow resistivity on in-plane field-orientation showed a fourfold symmetry with broad maxima along the \([0, \pm 1, \pm 1]\) directions and cusp-like minima along the \([0, \pm 1, 0]\) and \([0, 0, \pm 1]\) directions. The origin of the fourfold symmetry in terms of the interplay between the \(d\)-wave superconducting gap symmetry and the anisotropic viscous motion of the vortices is discussed.
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