Upper Critical Field of the 3 Kelvin Phase in Sr2RuO4

Details Upper Critical Field of the 3 Kelvin Phase in Sr2RuO4 Upper Critical Field of the 3 Kelvin Phase in Sr2RuO4

2003-04-23

arxiv.org/abs/cond-mat/0304510v2

J. Phys. Soc. Jpn. Vol. 72, 1623-1626 (2003)

Physics

Condensed Matter

Superconductivity

4 pages, 3 figures

Scientific paper

10.1143/JPSJ.72.1623

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)^{\gamma} with 0.5 \leq \gamma < 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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