Abstract
Anisotropic superconducting flux-line behavior of single-crystal \ensuremath{\kappa}-[bis(ethylenedithio)tetrathiaful- valene${]}_{2}$Cu[N(CN${)}_{2}$]Br has been studied with dc magnetization and vibrating-reed (VR) techniques. A peak at ${\mathit{T}}^{\mathrm{*}}$(H) in the temperature dependence of the VR inverse quality factor 1/Q exhibits a shoulder for magnetic fields 0${\mathrm{\ensuremath{\mu}}}_{0}$H\ensuremath{\le}0.5 T parallel to the conducting ac plane. The shoulder becomes unresolved near a kink in T*(H) at ${\mathrm{\ensuremath{\mu}}}_{0}$H\ensuremath{\approxeq}0.7 T. Discontinuities in 1/Q and the VR frequency shift occur for 0.1\ensuremath{\le}${\mathrm{\ensuremath{\mu}}}_{0}$H\ensuremath{\le}1.3 T applied perpendicular to the ac plane and temperatures T\ensuremath{\le}20 K, well into the normal state. These anomalies are preliminary evidence for a field-induced magnetic phase transition and unconventional superconductivity.
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