Anomalous Flux Pinning in ?-Pyrochlore Oxide Superconductor KOs2O6

Abstract

The superconducting transition of the ?-pyrochlore oxide KOs2O6 with Tc = 9.60 K is studied by resistivity measurements under various magnetic fields using a high-quality single crystal. The reentrant behavior of superconductivity is observed near Tc in low magnetic fields below 2 T. The recovered resistance probably due to flux flow exhibits an anomalous angle dependence, indicating that flux pinning is enhanced in magnetic fields along certain crystallographic directions such as [110], [001] and [112]. It is suggested that there is an intrinsic pinning mechanism coming from the specific crystal structure of the ?-pyrochlore oxide.

arXiv comment15 pages, 5 figures, J. Phys. Soc. Jpn., in press

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• Extremely strong-coupling superconductivity and anomalous lattice properties in the beta-pyrochlore oxide KOs2O6
• Rattling-Induced Superconductiviy in the Beta-Pyrochlore Oxides AOs2O6
• Chemical trends of superconducting properties in pyrochlore oxides
• A second phase transition and superconductivity in the beta-pyrochlore oxide KOs2O6