首页|Quantum spin driven Yu-Shiba-Rusinov multiplets and fermion-parity-preserving phase transition in K3C60

Quantum spin driven Yu-Shiba-Rusinov multiplets and fermion-parity-preserving phase transition in K3C60

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Magnetic impurities in superconductors are of increasing interest due to emergent Yu-Shiba-Rusinov(YSR)states and Majorana zero modes for fault-tolerant quantum computation.However,a direct rela-tionship between the YSR multiple states and magnetic anisotropy splitting of quantum impurity spins remains poorly characterized.By using scanning tunneling microscopy,we systematically resolve indi-vidual transition-metal(Fe,Cr,and Ni)impurities induced YSR multiplets as well as their Zeeman effects in the K3C60 superconductor.The YSR multiplets show identical d orbital-like wave functions that are symmetry-mismatched to the threefold K3C60(1 1 1)host surface,breaking point-group symmetries of the spatial distribution of YSR bound states in real space.Remarkably,we identify an unprecedented fermion-parity-preserving quantum phase transition between ground states with opposite signs of the uniaxial magnetic anisotropy that can be manipulated by an external magnetic field.These findings can be readily understood in terms of anisotropy splitting of quantum impurity spins,and thus elucidate the intricate interplay between the magnetic anisotropy and YSR multiplets.

Magnetic anisotropyYSR multipletsQuantum spinQuantum phase transitionIdentical wave functionsZeeman effects

Shu-Ze Wang、Xue-Qing Yu、Li-Xuan Wei、Li Wang、Qiang-Jun Cheng、Kun Peng、Fang-Jun Cheng、Yu Liu、Fang-Sen Li、Xu-Cun Ma、Qi-Kun Xue、Can-Li Song

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State Key Laboratory of Low-Dimensional Quantum Physics,Department of Physics,Tsinghua University,Beijing 100084,China

Vacuum Interconnected Nanotech Workstation,Suzhou Institute of Nano-Tech and Nano-Bionics,Chinese Academy of Sciences,Suzhou 215123,China

Frontier Science Center for Quantum Information,Beijing 100084,China

Beijing Academy of Quantum Information Sciences,Beijing 100193,China

Southern University of Science and Technology,Shenzhen 518055,China

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国家重点研发计划国家重点研发计划国家自然科学基金国家自然科学基金Suzhou Science and Technology ProgramNano-X from the Suzhou Institute of Nano-Tech and Nano-Bionics(SINANO)中国科学院项目

2022YFA14031002017YFA03046001214140352388201SJC2021009

2024

10.1016/j.scib.2024.03.052

科学通报(英文版)
中国科学院

科学通报(英文版)

CSTPCD
ISSN：1001-6538
年,卷(期)：2024.69(10)
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