Suppression of superconductivity in Sr2RuO4 caused by defects

Z. Q. Mao; Y. Mori; Y. Maeno

doi:10.1103/PhysRevB.60.610

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Suppression of superconductivity in Sr2RuO4 caused by defects

Z. Q. Mao, Y. Mori, Y. Maeno

DOI 10.1103/PhysRevB.60.610 · Physical Review B

T1

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Abstract

We have investigated depairing effects in Sr2RuO4, the unconventional superconductor in the layered perovskite structure. We prepared crystals of Sr2RuO4 with very low levels of impurity elements, and systematically controled their superconducting transition temperature Tc ranging from 1.5 to 0.6 K by adjustments of crystal growth conditions. The dependence of Tc on the residual resistivity ρ0 in these crystals suggests that the defects are strong pair breakers, in addition to impurities. We further characterized the effects of pair breaking in this unconventional superconductor. We found that the in-plane coherence length ξab(0) evaluated from Hc2(T) is inversely proportional to Tc, and decreases with increasing mean free path l; the latter behavior is opposite to that of conventional superconductors. In addition, we examined the temperature dependence of Hc2∥c which substantially deviates from the BCS theory and even from a recent theory of a p-wave superconductor.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	1.5	Pressure unresolved	onset
Sr2RuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	0.6	Pressure unresolved	onset