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Upper Critical Field of the 3 Kelvin Phase in Sr2RuO4

Masashige Matsumoto·Cyril Belardinelli·Manfred Sigrist
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Abstract

The inhomogeneous 3 Kelvin phase is most likely a superconducting state nucleating at the interface between micrometer-sized Ru-metal inclusions and Sr2RuO4 above the bulk onset of superconductivity. This filamentary superconducting state yields a characteristic temperature dependence of the upper critical field which is sublinear, i.e., H_{c2} (T) \propto (T^* - T)^γ with 0.5 \leq γ< 1 (T^*: nucleation temperature). The Ginzburg-Landau theory is used to analyze the behavior of the nucleated spin-triplet phase in a field and the characteristic features of H_{c2} observed in the experiment are explained based on a two-component order parameter in the presence of a filament of enhanced superconductivity with a finite width.

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Masashige Matsumoto, Cyril Belardinelli, Manfred Sigrist. 2003-08-07. Upper Critical Field of the 3 Kelvin Phase in Sr2RuO4. https://doi.org/10.1143/jpsj.72.1623

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