Superconducting Properties and Absence of Time Reversal Symmetry Breaking in the Noncentrosymmetric Superconducting Compounds Ta$_{x}$Re$_{1-x}$($0.1\leq x \leq0.25$)
1 School of Physics and Key Laboratory of MEMS of the Ministry of Education, Southeast University, Nanjing 211189, China 2Department of Applied Physics, Zhejiang University of Technology, Hangzhou 310023, China 3School of Electronic and Information Engineering, Changshu Institute of Technology, Changshu 215500, China 4Department of Physics, Zhejiang University, Hangzhou 310007, China 5Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-2320, USA 6ISIS Pulsed Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Campus, Didcot, Oxfordshire OX11 0QX, United Kingdom
Abstract：Unconventional superconductivity, in particular, in noncentrosymmetric systems, has been a long-sought topic in condensed matter physics. Recently, Re-based superconductors have attracted great attention owing to the potential time-reversal symmetry breaking in their superconducting states. We report the superconducting properties of noncentrosymmetric compounds Ta$_{x}$Re$_{1-x}$ with $0.1\leq x \leq0.25$, and find that the superconducting transition temperature reaches a maximum of $\sim$8 K at the optimal level $x=0.15$. Nevertheless, muon-spin rotation and relaxation measurements reveal no time-reversal symmetry breaking existing in its superconducting state, which is in sharp contrast to both centrosymmetric Re metal and many other noncentrosymmetric Re-based superconductors.
Shang T, Pang G M, Baines C, Jiang W B, Xie W, Wang A, Medarde M, Pomjakushina E, Shi M, Mesot J, Yuan H Q and Shiroka T 2018 Phys. Rev. B97 020502(R)
[18]
Shang T, Smidman M, Ghosh S K, Baines C, Chang L J, Gawryluk D J, Barker J A T, Singh R P, Paul D M, Balakrishnan G, Pomjakushina E, Shi M, Medarde M, Hillier A D, Yuan H Q, Quintanilla J, Mesot J and Shiroka T 2018 Phys. Rev. Lett.121 257002
Xu X, Chen B, Jiao W H, Chen B, Niu C Q, Li Y K, Yang J H, Bangura A F, Ye Q L, Cao C, Dai J H, Cao G and Hussey N E 2013 Phys. Rev. B87 224507
[27]
Xu C Q, Li B, Feng J J, Jiao W H, Li Y K, Liu S W, Zhou Y X, Sankar R, Zhigadlo N D, Wang H B, Han Z D, Qian B, Ye W, Zhou W, Shiroka T, Biswas P K, Xu X F and Shi Z X 2019 Phys. Rev. B100 134503
Khasanov R, Conder K, Pomjakushina E, Amato A, Baines C, Bukowski Z, Karpinski J, Katrych S, Klauss H H, Luetkens H, Shengelaya A and Zhigadlo N D 2008 Phys. Rev. B78 220510(R)
2021, Vol. 38 
