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

Abstract

The entire temperature dependence of the upper critical field $H_{c2}$ in the $\beta$-pyrochlore KOs${}_2$O${}_6$ is obtained from high-field resistivity and magnetic measurements. Both techniques identically give $H_{c2}(T\simeq 0\mathrm{K})$ not only surprisingly high ($\sim 33$ T), but also the approach to it unusually temperature-\emph{linear} all the way below $T_{\mathrm{c}}$ (= 9.6 K). We show that, while $H_{c2}(0)$ exceeds a simple spin-singlet paramagnetic limit $H_{\mathrm{P}}$, it is well below an $H_{\mathrm{P}}$ 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 $H_{c2}$ show that the unusual temperature dependence is reproduced if dominant s-wave superconductivity resides on the smaller closed Fermi surfaces.

arXiv comment5 pages, 3 figures. Version accepted for publication as a Rapid Communication in Phys. Rev. B

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• Neutron Scattering Study of the Localized Mode in the beta-Pyrochlore Superconductors AOs2O6
• Nematic superconductivity in the topological semimetal CaSn${}_3$
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• Using Josephson junctions to determine the pairing state of superconductors without crystal inversion symmetry
• Scanning Tunneling Spectroscopy in the Superconducting State and Vortex Cores of the beta-pyrochlore KOs2O6
• Structural and Superconducting Properties of RbOs2O6 Single Crystals
• Large and homogeneous mass enhancement in the rattling-induced superconductor KOs${}_2$O${}_6$
• Upper critical field and de Haas-van Alphen oscillations in KOs${}_2$O${}_6$ measured in a hybrid magnet
• Effect of equatorial line nodes on upper critical field and London penetration depth