Superconducting transition of Ru in SQUIDs with Nb/Ru/Sr2RuO4 junctions

27th International Conference on Low Temperature Physics

Nago, Y.^1 ; Ishiguro, R.^2 ; Sakurai, T.^1 ; Yakabe, M.^1 ; Nakamura, T.^3 ; Yonezawa, S.^4 ; Kashiwaya, S.^5 ; Takayanagi, H.^1,6 ; Maeno, Y.^4

Department of Applied Physics, Faculty of Science, Tokyo University of Science, Tokyo, Japan^1

Center for Emergent Matter Science, RIKEN, Wako, Saitama, Japan^2

Institute of Solid State Physics (ISSP), University of Tokyo, Kashiwa, Chiba, Japan^3

Department of Physics, Graduate School of Science, Kyoto University, Kyoto, Japan^4

National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki, Tsukuba, Japan^5

International Center for Materials Nanoarchitectonics (MANA), National Institute for Materials Science (NIMS), Ibaraki, Tsukuba, Japan^6

关键词: Anomalous interferences;    Direct current;    Energy competition;    Eutectic crystals;    Fraunhofer diffraction patterns;    Magnetic response;    Superconducting transitions;    Topological effects;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/568/2/022031/pdf
DOI  :  10.1088/1742-6596/568/2/022031

来源: IOP

【 摘 要 】

We have measured transport properties and magnetic responses of direct current superconducting quantum interference devices(dc-SQUIDs) with Nb/Ru/Sr2RuO4junctions on The same Ru inclusion of a Sr2RuO4-Ru eutectic crystal. We observed a superconducting transition of The Ru at 0.50 K and another transition with anomalous interference patterns of The SQUID at 0.40 K. The second transition led to change of The SQUID structure due to energy competition of alternative supercurrent paths. Phase shifts of The peak of The Fraunhofer diffraction pattern were observed below The transition temperatures, implying topological effects due to a chiral p-wave state or its competition with a s-wave state.