Upper Critical Field of the 3 Kelvin Phase in Sr_2RuO_4 (Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties)

概要

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The inhomogeneous 3 Kelvin phase is most likely a superconducting state nucleating at the interface between micrometer-sized Ru-metal inclusions and Sr_2RuO_4 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) ∝ (T^*-T)^γ with 0.5 ≤ 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.
社団法人日本物理学会の論文
2003-07-15