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Multigap nodeless superconductivity in the Dirac intermetallic alloy V2Ga5 with one-dimensional vanadium chains

C. Q. Xu1,*, C. C. Zhao2,*, Y. Shen3,*, D. Ratkovski4, X. Ma5,6, W. Zhou7, Xunqing Yin8,9,10, B. Li11, A. F. Bangura4 et al.

Chao Cao5,6, Baomin Wang1,†, Ziming Zhu3,‡, X. Ke12, Dong Qian8,9,10, Shiyan Li2,§, and Xiaofeng Xu13,∥

  • 1School of Physical Science and Technology, Ningbo University, Ningbo 315211, China
  • 2State Key Laboratory of Surface Physics, Department of Physics, Fudan University, Shanghai 200438, China
  • 3Key Laboratory of Low-Dimensional Quantum Structures and Quantum Control of Ministry of Education, Department of Physics and Synergetic Innovation Center for Quantum Effects and Applications, Hunan Normal University, Changsha 410081, China
  • 4National High Magnetic Field Laboratory, Tallahassee, Florida 32310, USA
  • 5School of Physics, Zhejiang University, Hangzhou 310058, China
  • 6Center for Correlated Matter, Zhejiang University, Hangzhou 310058, China
  • 7School of Electronic and Information Engineering, Changshu Institute of Technology, Changshu 215500, China
  • 8Key Laboratory of Artificial Structures and Quantum Control (Ministry of Education), School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China
  • 9Tsung-Dao Lee Institute, Shanghai Jiao Tong University, Shanghai 200240, China
  • 10Collaborative Innovation Center of Advanced Microstructures, Nanjing 210093, China
  • 11Information Physics Research Center, Nanjing University of Posts and Telecommunications, Nanjing 210023, China
  • 12Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-2320, USA
  • 13Department of Applied Physics, Zhejiang University of Technology, Hangzhou 310023, China

  • *These authors contributed equally to this work.
  • †wangbaomin@nbu.edu.cn
  • ‡zimingzhu@hunnu.edu.cn
  • §shiyan_li@fudan.edu.cn
  • ∥xuxiaofeng@zjut.edu.cn

Phys. Rev. B 109, L100506 – Published 21 March, 2024

DOI: https://doi.org/10.1103/PhysRevB.109.L100506

Abstract

Superconductors possessing diverse symmetry-enforced topological states have been a subject of intense interest as they are arguably one of the most feasible candidates to realize so-called topological superconductivity, a source of Majorana fermions that hold great promise for topological quantum computing. Here we study the low-lying quasiparticle excitations in the superconducting intermetallic alloy V2Ga5 by low-temperature heat capacity and ultra-low-temperature thermal conductivity measurements. It is found that its electronic specific heat can be fitted by either a d-wave gap or two s-wave gaps. However, the low-T thermal conductivity clearly points to the multiple nodeless energy gaps in its low-lying excitation spectrum. On the other hand, first-principles calculations reveal a multitude of topological fermions near the Fermi level, involving discrete Dirac nodes as well as Dirac nodal lines. These topological carriers, when condensed into Cooper pairs, provide a natural platform for achieving topologically nontrivial phases and possible Majorana fermions.

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