J. Phys. Soc. Jpn. 86, 114708 (2017) [6 Pages]
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Investigation of the Vortex States of Sr2RuO4-Ru Eutectic Microplates Using DC-SQUIDs

Daisuke Sakuma1,4, Yusuke Nago1,2,4,, Ryosuke Ishiguro3,4, Satoshi Kashiwaya5, Shintaro Nomura6, Kimitoshi Kono4, Yoshiteru Maeno7, and Hideaki Takayanagi1
+ Affiliations
1Tokyo University of Science, Katsushika, Tokyo 125-8585, Japan2Keio University, Yokohama 223-8522, Japan3Japan Women’s University, Bunkyo, Tokyo 112-8681, Japan4RIKEN CEMS, Wako, Saitama 351-0198, Japan5National Institute of Advanced Industrial Science and Technology, Tsukuba, Ibaraki 305-8568, Japan6University of Tsukuba, Tsukuba, Ibaraki 305-8571, Japan7Kyoto University, Kyoto 606-8502, Japan
Received November 8, 2016; Accepted August 21, 2017; Published October 16, 2017

We investigated the magnetic properties of a Sr2RuO4-Ru eutectic microplate containing a single Ru-inclusion using micrometer-sized DC-SQUIDs (direct-current superconducting quantum interference devices). A phase frustration at the interface between chiral p-wave superconducting Sr2RuO4 and s-wave superconducting Ru is expected to cause novel magnetic vortex states such as the spontaneous Ru-center vortex under zero magnetic field [as reported by H. Kaneyasu and M. Sigrist, J. Phys. Soc. Jpn. 79, 053706 (2010)]. Our experimental results show no positive evidence for such a spontaneous vortex state. However, in an applied field, an abrupt change in the magnetic flux distribution was observed at a superconducting transition of Ru. The flux distribution is clarified by comparing our experimental results with electromagnetic field simulations in our sample geometry. We discuss the transition of the vortex states and the superconducting coupling at the Sr2RuO4/Ru interface.

©2017 The Physical Society of Japan
https://doi.org/10.7566/JPSJ.86.114708

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