Prominent Josephson tunneling between twisted single copper oxide planes of Bi2Sr2-xLaxCuO6+y

Wang，Heng1; Zhu，Yuying2,3; Bai，Zhonghua1; Wang，Zechao4,5; Hu，Shuxu1; Xie，Hong Yi2; Hu，Xiaopeng1; Cui，Jian2; Huang，Miaoling2; Chen，Jianhao2,6; Ding，Ying7; Zhao，Lin7; Li，Xinyan7; Zhang，Qinghua7; Gu，Lin4,7; Zhou，X. J.7; Zhu，Jing4,5; Zhang，Ding1,2,8; Xue，Qi Kun1,2,9

2023-12-01

10.1038/s41467-023-40525-1

Nature Communications   Impact Factor & Quartile

2041-1723

Josephson tunneling in twisted cuprate junctions provides a litmus test for the pairing symmetry, which is fundamental for understanding the microscopic mechanism of high temperature superconductivity. This issue is rekindled by experimental advances in van der Waals stacking and the proposal of an emergent d+id-wave. So far, all experiments have been carried out on BiSrCaCuO (Bi-2212) with double CuO planes but show controversial results. Here, we investigate junctions made of BiSrLaCuO (Bi-2201) with single CuO planes. Our on-site cold stacking technique ensures uncompromised crystalline quality and stoichiometry at the interface. Junctions with carefully calibrated twist angles around 45° show strong Josephson tunneling and conventional temperature dependence. Furthermore, we observe standard Fraunhofer diffraction patterns and integer Fiske steps in a junction with a twist angle of 45.0±0.2°. Together, these results pose strong constraints on the d or d+id-wave pairing and suggest an indispensable isotropic pairing component.

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National Natural Science Foundation of China-Yunnan Joint Fund[11888101];National Natural Science Foundation of China-Yunnan Joint Fund[12004041];National Natural Science Foundation of China-Yunnan Joint Fund[12141402];National Natural Science Foundation of China-Yunnan Joint Fund[12274249];Ministry of Science and Technology of the People's Republic of China[2021YFA1401800];National Natural Science Foundation of China-Yunnan Joint Fund[51991344];National Natural Science Foundation of China-Yunnan Joint Fund[52025025];National Natural Science Foundation of China-Yunnan Joint Fund[52072400];National Natural Science Foundation of China-Yunnan Joint Fund[52388201];

Science & Technology - Other Topics

Multidisciplinary Sciences

WOS:001054831600026

NATURE PORTFOLIO

2-s2.0-85168742237

Scopus

1.State Key Laboratory of Low Dimensional Quantum Physics and Department of Physics,Tsinghua University,Beijing,100084,China
2.Beijing Academy of Quantum Information Sciences,Beijing,100193,China
3.Hefei National Laboratory,Hefei,230088,China
4.National Center for Electron Microscopy in Beijing,School of Materials Science and Engineering,Key Laboratory of Advanced Materials (MOE),The State Key Laboratory of New Ceramics and Fine Processing,Tsinghua University,Beijing,100084,China
5.Ji Hua Laboratory,Foshan,Guangdong,528200,China
6.International Center for Quantum Materials,School of Physics,Peking University,Beijing,100091,China
7.Institute of Physics,Chinese Academy of Sciences,Beijing,100190,China
8.RIKEN Center for Emergent Matter Science (CEMS),Wako,Saitama,351-0198,Japan
9.Southern University of Science and Technology,Shenzhen,518055,China

Wang，Heng,Zhu，Yuying,Bai，Zhonghua,et al. Prominent Josephson tunneling between twisted single copper oxide planes of Bi2Sr2-xLaxCuO6+y[J]. Nature Communications,2023,14(1).

Wang，Heng.,Zhu，Yuying.,Bai，Zhonghua.,Wang，Zechao.,Hu，Shuxu.,...&Xue，Qi Kun.(2023).Prominent Josephson tunneling between twisted single copper oxide planes of Bi2Sr2-xLaxCuO6+y.Nature Communications,14(1).

Wang，Heng,et al."Prominent Josephson tunneling between twisted single copper oxide planes of Bi2Sr2-xLaxCuO6+y".Nature Communications 14.1(2023).