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J. Phys. Soc. Jpn. 78 (2009) 103705 (4 pages)  |Previous Article| |Next Article|  |Table of Contents|
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Large Enhancement of 3-K Phase Superconductivity in the Sr2RuO4–Ru Eutectic System by Uniaxial Pressure

Shunichiro Kittaka1, Hiroshi Yaguchi1,2, and Yoshiteru Maeno1

1Department of Physics, Graduate School of Science, Kyoto University, Kyoto 606-8502
2Department of Physics, Faculty of Science and Technology, Tokyo University of Science, Noda, Chiba 278-8510

(Received June 11, 2009; Accepted August 24, 2009; Published October 13, 2009)

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. ©2009 The Physical Society of Japan

URL: http://jpsj.ipap.jp/link?JPSJ/78/103705/
DOI: 10.1143/JPSJ.78.103705


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