Evolution of supercurrent path in Nb/Ru/Sr2RuO4 dc-SQUIDs

Y. Nago; R. Ishiguro; T. Sakurai; M. Yakabe; T. Nakamura; S. Yonezawa; S. Kashiwaya; H. Takayanagi; Y. Maeno

doi:10.1103/PhysRevB.94.054501

Evolution of supercurrent path in Nb/Ru/Sr2RuO4 dc-SQUIDs

Y. Nago, R. Ishiguro, T. Sakurai, M. Yakabe, T. Nakamura, S. Yonezawa, S. Kashiwaya, H. Takayanagi, Y. Maeno

Department of Physics

Research output: Contribution to journal › Article › peer-review

6 Citations (Scopus)

Abstract

Phase-sensitive measurements of direct-current superconducting quantum interference devices (dc-SQUIDs) composed of Sr2RuO4-Ru eutectic crystals have been performed to temperatures below a bulk Ru superconducting transition temperature at 0.49 K. A SQUID with Nb/Ru/Sr2RuO4 junctions fabricated on one Ru inclusion exhibits two distinct transitions due to the Ru superconducting transition and competition of proximity-induced superconducting gaps at the junctions. At sufficiently low temperatures, the SQUID interference patterns start to collapse with large phase shifts of the Fraunhofer patterns. This result indicates the influence of magnetic fluxes induced by large bias currents flowing in a strongly asymmetric supercurrent path. Such a large change in supercurrent path suggests superconducting phase mismatch between the s-wave and chiral p-wave states at the Ru/Sr2RuO4 interface.

Original language	English
Article number	054501
Journal	Physical Review B
Volume	94
Issue number	5
DOIs	https://doi.org/10.1103/PhysRevB.94.054501
Publication status	Published - 2016 Aug 1

ASJC Scopus subject areas

Electronic, Optical and Magnetic Materials
Condensed Matter Physics

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title = "Evolution of supercurrent path in Nb/Ru/Sr2RuO4 dc-SQUIDs",

abstract = "Phase-sensitive measurements of direct-current superconducting quantum interference devices (dc-SQUIDs) composed of Sr2RuO4-Ru eutectic crystals have been performed to temperatures below a bulk Ru superconducting transition temperature at 0.49 K. A SQUID with Nb/Ru/Sr2RuO4 junctions fabricated on one Ru inclusion exhibits two distinct transitions due to the Ru superconducting transition and competition of proximity-induced superconducting gaps at the junctions. At sufficiently low temperatures, the SQUID interference patterns start to collapse with large phase shifts of the Fraunhofer patterns. This result indicates the influence of magnetic fluxes induced by large bias currents flowing in a strongly asymmetric supercurrent path. Such a large change in supercurrent path suggests superconducting phase mismatch between the s-wave and chiral p-wave states at the Ru/Sr2RuO4 interface.",

author = "Y. Nago and R. Ishiguro and T. Sakurai and M. Yakabe and T. Nakamura and S. Yonezawa and S. Kashiwaya and H. Takayanagi and Y. Maeno",

note = "Funding Information: We would like to thank S. Nomura from the University of Tsukuba for stimulating discussions. This work was supported by Japan Society for the Promotion of Science (JSPS) KAKENHI (Grants No. 20221007, No. 25103721, No. 15H05852, No. 15H05853, and No. 15K17708). Device fabrication was supported by the NIMS Nanofabrication platform of the 'Nanotechnology Platform Project' sponsored by The Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.",

year = "2016",

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doi = "10.1103/PhysRevB.94.054501",

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T1 - Evolution of supercurrent path in Nb/Ru/Sr2RuO4 dc-SQUIDs

AU - Nago, Y.

AU - Ishiguro, R.

AU - Sakurai, T.

AU - Yakabe, M.

AU - Nakamura, T.

AU - Yonezawa, S.

AU - Kashiwaya, S.

AU - Takayanagi, H.

AU - Maeno, Y.

N1 - Funding Information: We would like to thank S. Nomura from the University of Tsukuba for stimulating discussions. This work was supported by Japan Society for the Promotion of Science (JSPS) KAKENHI (Grants No. 20221007, No. 25103721, No. 15H05852, No. 15H05853, and No. 15K17708). Device fabrication was supported by the NIMS Nanofabrication platform of the 'Nanotechnology Platform Project' sponsored by The Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.

PY - 2016/8/1

Y1 - 2016/8/1

N2 - Phase-sensitive measurements of direct-current superconducting quantum interference devices (dc-SQUIDs) composed of Sr2RuO4-Ru eutectic crystals have been performed to temperatures below a bulk Ru superconducting transition temperature at 0.49 K. A SQUID with Nb/Ru/Sr2RuO4 junctions fabricated on one Ru inclusion exhibits two distinct transitions due to the Ru superconducting transition and competition of proximity-induced superconducting gaps at the junctions. At sufficiently low temperatures, the SQUID interference patterns start to collapse with large phase shifts of the Fraunhofer patterns. This result indicates the influence of magnetic fluxes induced by large bias currents flowing in a strongly asymmetric supercurrent path. Such a large change in supercurrent path suggests superconducting phase mismatch between the s-wave and chiral p-wave states at the Ru/Sr2RuO4 interface.

AB - Phase-sensitive measurements of direct-current superconducting quantum interference devices (dc-SQUIDs) composed of Sr2RuO4-Ru eutectic crystals have been performed to temperatures below a bulk Ru superconducting transition temperature at 0.49 K. A SQUID with Nb/Ru/Sr2RuO4 junctions fabricated on one Ru inclusion exhibits two distinct transitions due to the Ru superconducting transition and competition of proximity-induced superconducting gaps at the junctions. At sufficiently low temperatures, the SQUID interference patterns start to collapse with large phase shifts of the Fraunhofer patterns. This result indicates the influence of magnetic fluxes induced by large bias currents flowing in a strongly asymmetric supercurrent path. Such a large change in supercurrent path suggests superconducting phase mismatch between the s-wave and chiral p-wave states at the Ru/Sr2RuO4 interface.

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