Unequivocal Identification of Spin-Triplet and Spin-Singlet Superconductors with Upper Critical Field and Flux Quantization

C C Chiang; H C Lee; S C Lin; D Qu; M W Chu; C D Chen; C L Chien; S Y Huang

doi:10.1103/PhysRevLett.131.236003

Unequivocal Identification of Spin-Triplet and Spin-Singlet Superconductors with Upper Critical Field and Flux Quantization

Phys Rev Lett. 2023 Dec 8;131(23):236003. doi: 10.1103/PhysRevLett.131.236003.

Authors

C C Chiang^{1

2}, H C Lee¹, S C Lin³, D Qu^{3

4}, M W Chu^{3

4}, C D Chen⁵, C L Chien^{1

2}, S Y Huang^{1

4}

Affiliations

¹ Department of Physics, National Taiwan University, Taipei 10617, Taiwan.
² Willian H. Miller III Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.
³ Center for Condensed Matter Sciences, National Taiwan University, Taipei 10617, Taiwan.
⁴ Center of Atomic Initiatives for New Materials, National Taiwan University, Taipei 10617, Taiwan.
⁵ Institute of Physics, Academia Sinica, Taipei 11529, Taiwan.

PMID: 38134800
DOI: 10.1103/PhysRevLett.131.236003

Abstract

Spin-triplet superconductors play central roles in Majorana physics and quantum computing but are difficult to identify. We show the methods of kink-point upper critical field and flux quantization in superconducting rings can unequivocally identify spin-singlet, spin-triplet in centrosymmetric superconductors, and singlet-triplet admixture in noncentrosymmetric superconductors, as realized in γ-BiPd, β-Bi_{2}Pd, and α-BiPd, respectively. Our findings are essential for identifying triplet superconductors and exploring their quantum properties.