Uncommonly High Upper Critical Field in the Superconducting KOs $ _2 $ O $ _6 $ Pyrochlore (original) (raw)

Abstract

The entire temperature dependence of the upper critical field Hc2 in the β-pyrochlore KOs2O6 is obtained from high-field resistivity and magnetic measurements. Both techniques identically give Hc2(T ≃ 0 K) not only surprisingly high (∼ 33 T), but also the approach to it unusually temperature-linear all the way below Tc (= 9.6 K). We show that, while Hc2(0) exceeds a

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