Uncommonly High Upper Critical Field in the Superconducting KOs$_2$O$_6$ Pyrochlore

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dc.creatorShibauchi, T.
dc.creatorKrusin-Elbaum, L.
dc.creatorKasahara, Y.
dc.creatorShimono, Y.
dc.creatorMatsuda, Y.
dc.creatorMcDonald, R. D.
dc.creatorMielke, C. H.
dc.creatorYonezawa, S.
dc.creatorHiroi, Z.
dc.creatorArai, M.
dc.creatorKita, T.
dc.creatorBlatter, G.
dc.creatorSigrist, M.
dc.date2006-03-11
dc.date2006-11-13
dc.date.accessioned2026-07-07T07:36:30Z
dc.date.available2026-07-07T07:36:30Z
dc.descriptionThe entire temperature dependence of the upper critical field $H_{\rm c2}$ in the $β$-pyrochlore KOs$_2$O$_6$ is obtained from high-field resistivity and magnetic measurements. Both techniques identically give $H_{\rm c2}(T \simeq 0 {\rm K})$ not only surprisingly high ($\sim 33$ T), but also the approach to it unusually temperature-\emph{linear} all the way below $T_{\rm c}$ (= 9.6 K). We show that, while $H_{\rm c2}(0)$ exceeds a simple spin-singlet paramagnetic limit $H_{\rm P}$, it is well below an $H_{\rm P}$ enhanced due to the missing spatial inversion symmetry reported recently in KOs$_2$O$_6$, ensuring that the pair-breaking here is executed by orbital degrees. {\it Ab initio} calculations of orbital $H_{\rm c2}$ show that the unusual temperature dependence is reproduced if dominant s-wave superconductivity resides on the smaller closed Fermi surfaces.
dc.description5 pages, 3 figures. Version accepted for publication as a Rapid Communication in Phys. Rev. B
dc.identifierhttps://arxiv.org/abs/cond-mat/0603309
dc.identifierhttp://arxiv.org/abs/cond-mat/0603309
dc.identifierPhys. Rev. B 74, 220506(R) (2006)
dc.identifierdoi:10.1103/PhysRevB.74.220506
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/120448
dc.subjectSuperconductivity
dc.subjectStrongly Correlated Electrons
dc.titleUncommonly High Upper Critical Field in the Superconducting KOs$_2$O$_6$ Pyrochlore
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