Superconductor-Metal Quantum Transition at the EuO/KTaO$_{3}$ Interface
Yang Ma1†, Jiasen Niu1†, Wenyu Xing1, Yunyan Yao1, Ranran Cai1, Jirong Sun2,3, X. C. Xie1,4,5, Xi Lin1,4,5*, and Wei Han1*
1International Center for Quantum Materials, School of Physics, Peking University, Beijing 100871, China 2Beijing National Laboratory for Condensed Matter Physics & Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China 3School of Physical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China 4CAS Center for Excellence in Topological Quantum Computation, University of Chinese Academy of Sciences, Beijing 100190, China 5Beijing Academy of Quantum Information Sciences, Beijing 100193, China
Abstract：We report the experimental investigation of the superconductor-metal quantum phase transition of the EuO/KTaO$_{3}$ interface. Around the transition, a divergence of the dynamical critical exponent is observed, which supports the quantum Griffiths singularity in the EuO/KTaO$_{3}$ interface. The quantum Griffiths singularity could be attributed to large rare superconducting regions and quenched disorders at the interface. Our results could pave the way for studying the exotic superconducting properties at the EuO/KTaO$_{3}$ interface.
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2020, Vol. 37 
