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The eutectic system Sr2RuO4-Ru is referred to as the 3-K phase of thespin-triplet supeconductor Sr2RuO4 because of its enhanced superconductingtransition temperature Tc of ~3 K. We have investigated the field-temperature(H-T) phase diagram of the 3-K phase for fields parallel and perpendicular tothe ab-plane of Sr2RuO4, using out-of-plane resistivity measurements. We havefound an upturn curvature in the Hc2(T) curve for H // c, and a rather gradualtemperature dependence of Hc2 close to Tc for both H // ab and H // c. We havealso investigated the dependence of Hc2 on the angle between the field and theab-plane at several temperatures. Fitting the Ginzburg-Landau effective-massmodel apparently fails to reproduce the angle dependence, particularly near H// c and at low temperatures. We propose that all of these charecteric featurescan be explained, at least in a qualitative fashion, on the basis of a theoryby Sigrist and Monien that assumes surface superconductivity with atwo-component order parameter occurring at the interface between Sr2RuO4 and Ruinclusions. This provides evidence of the chiral state postulated for the 1.5-Kphase by several experiments.

physical review. b, condensed matter

Interface superconductivity in the eutectic<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Sr</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">RuO</mml:mi></mml:mrow><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mo>−</mml:mo><mml:mi mathvariant="normal">Ru</mml:mi><mml:mo>:</mml:mo></mml:math>3-K phase …

Interface superconductivity in the eutecticSr2RuO4−Ru:3-K phase …