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arXiv · 1501.02868

Higher-Tc Superconducting Phase in Sr2RuO4 Induced by In-Plane Uniaxial Pressure

Haruka Taniguchi·Keigo Nishimura·Swee K. Goh·Shingo Yonezawa·Yoshiteru Maeno
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Abstract

We revealed that the superconducting transition temperature Tc of the multi-component superconductor Sr2RuO4 is enhanced to 3.3 K under in-plane uniaxial pressure that reduces the tetragonal crystal symmetry. This result suggests that new superconducting phases with a one-component order parameter are induced. We have also clarified the inplane pressure direction dependence of the emergence of this higher-Tc superconducting phase: pressure along the [100] direction is more favorable than pressure along the [110] direction. This result is probably closely related to the direct shortening of the in-plane Ru-O bond length along the pressure direction and the approach of the gamma Fermi surface to the van Hove singularity under the pressure parallel to the [100] direction.

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Haruka Taniguchi, Keigo Nishimura, Swee K. Goh, Shingo Yonezawa, Yoshiteru Maeno. 2015-01-13. Higher-Tc Superconducting Phase in Sr2RuO4 Induced by In-Plane Uniaxial Pressure. https://doi.org/10.7566/jpsj.84.014707

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