Magnetic field penetration depth of an organic superconductor: Evidence for anisotropic superconductivity of gapless nature
Kazushi KanodaDepartment of Physics, Gakushuin University, Mejiro, Toshima-ku, Tokyo 171, JapanK. AkibaDepartment of Physics, Gakushuin University, Mejiro, Toshima-ku, Tokyo 171, JapanKumi SuzukiDepartment of Physics, Gakushuin University, Mejiro, Toshima-ku, Tokyo 171, JapanToshihiro TakahashiDepartment of Physics, Gakushuin University, Mejiro, Toshima-ku, Tokyo 171, JapanGunzi SaitoDepartment of Physics, Gakushuin University, Mejiro, Toshima-ku, Tokyo 171, Japan
1990en
ABI
Annotatsiya
The temperature dependence of the magnetic-field penetration depth \ensuremath{\lambda} of the organic superconductor \ensuremath{\kappa}-[bis(ethylenedithio)-tetrathiafulvalene${]}_{2}$Cu(NCS${)}_{2}$ has been determined by means of complex susceptibility measurements for single crystals. \ensuremath{\lambda} was found to follow a power law, \ensuremath{\lambda}(T)/\ensuremath{\lambda}(0)-1\ensuremath{\propto}(T/${\mathit{T}}_{\mathit{c}}$${)}^{2}$, at low temperatures instead of the exponential behavior expected from BCS theory. This result is considered as the first evidence for anisotropic superconductivity with nodes of the gap parameter on the Fermi surface in this material.
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