Investigation of the vortex states of Sr2RuO4-Ru eutectic microplates using DC-SQUIDs

Daisuke Sakuma, Yusuke Nago, Ryosuke Ishiguro, Satoshi Kashiwaya, Shintaro Nomura, Kimitoshi Kono, Yoshiteru Maeno, Hideaki Takayanagi

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Abstract

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

Original languageEnglish
Article number114708
JournalJournal of the Physical Society of Japan
Volume86
Issue number11
DOIs
Publication statusPublished - 2017 Nov 15

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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    Sakuma, D., Nago, Y., Ishiguro, R., Kashiwaya, S., Nomura, S., Kono, K., Maeno, Y., & Takayanagi, H. (2017). Investigation of the vortex states of Sr2RuO4-Ru eutectic microplates using DC-SQUIDs. Journal of the Physical Society of Japan, 86(11), [114708]. https://doi.org/10.7566/JPSJ.86.114708