Large Enhancement of 3-K Phase Superconductivity in the Sr<SUB>2</SUB>RuO<SUB>4</SUB>–Ru Eutectic System by Uniaxial Pressure

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  • Kittaka Shunichiro
    Department of Physics, Graduate School of Science, Kyoto University
  • Yaguchi Hiroshi
    Department of Physics, Graduate School of Science, Kyoto University Department of Physics, Faculty of Science and Technology, Tokyo University of Science
  • Maeno Yoshiteru
    Department of Physics, Graduate School of Science, Kyoto University

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  • Large enhancement of 3-K phase superconductivity in the Sr2RuO4-Ru eutectic system by uniaxial pressure

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Abstract

While the superconducting transition temperature Tc of Sr2RuO4 is 1.5 K, its onset Tc is enhanced as high as 3 K in the Sr2RuO4–Ru eutectic system, which is often referred to as the 3-K phase. We have investigated effects of uniaxial pressure on the non-bulk superconductivity in the 3-K phase. While Tc of pure Sr2RuO4 is known to be suppressed by hydrostatic pressure, a large enhancement of the superconducting volume fraction of the 3-K phase was observed for both out-of-plane and in-plane uniaxial pressures. Especially, under the in-plane pressure, the shielding fraction at 1.8 K of only less than 0.5% at 0 GPa exceeds 40% at 0.4 GPa. Such a large shielding fraction suggests that under the uniaxial pressure interfacial 3-K phase superconductivity penetrates deep into the bulk of Sr2RuO4. The present finding provides a significant implication to the unresolved origin of the enhancement of Tc to 3 K in the Sr2RuO4–Ru eutectic system.

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