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26 April 2024

» arxiv » cond-mat/0603309

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Uncommonly High Unsaturated Upper Critical Field in the Pyrochlore Superconductor KOs$_2$O$_6$ Below Enhanced Paramagnetic Limit
T. Shibauchi ; L. Krusin-Elbaum ; Y. Kasahara ; Y. Shimono ; Y. Matsuda ; R. McDonald ; C. H. Mielke ; S. Yonezawa ; Z. Hiroi ; M. Arai ; T. Kita ; G. Blatter ; M. Sigrist ;
Date:	11 Mar 2006
Subject:	Superconductivity; Strongly Correlated Electrons
Abstract:	The entire temperature dependence of the upper critical field $H_{ m c2}$ in the $eta$-pyrochlore KOs$_2$O$_6$ is obtained from high-field resistivity and magnetic measurements. Both techniques identically give $H_{ m c2}(T simeq 0~{ m K})$ not only surprisingly high ($sim 33$ T), but also the approach to it unusually temperature-emph{linear} all the way below $T_{ m c}$ (= 9.6 K). We show that, while $H_{ m c2}(0)$ exceeds a simple spin-singlet paramagnetic limit $H_{ m P}$, it is well below an $H_{ m P}$ enhanced due to the missing spatial inversion symmetry reported recently in this compound, ensuring that the pair-breaking here is executed by orbital degrees. Our {it ab initio} calculations of orbital limiting field show that the unusual temperature dependence is reproduced if s-wave superconductivity resides on the smaller closed Fermi surfaces.
Source:	arXiv, cond-mat/0603309
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