Anomalous Flux Pinning in ?-Pyrochlore Oxide Superconductor KOs2O6

Zenji Hiroi; Shigeki Yonezawa

doi:10.1143/JPSJ.75.043701

Anomalous Flux Pinning in ?-Pyrochlore Oxide Superconductor KOs2O6

Superconductivity 2009-11-11 v1 Strongly Correlated Electrons

Authors: Zenji Hiroi , Shigeki Yonezawa

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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.

Keywords

superconductivity flux pinning pyrochlore oxide KOs2O6 magnetic field dependence

Cite

@article{arxiv.cond-mat/0602433,
  title  = {Anomalous Flux Pinning in ?-Pyrochlore Oxide Superconductor KOs2O6},
  author = {Zenji Hiroi and Shigeki Yonezawa},
  journal= {arXiv preprint arXiv:cond-mat/0602433},
  year   = {2009}
}

Comments

15 pages, 5 figures, J. Phys. Soc. Jpn., in press

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