Rotational Symmetry Breaking in a Trigonal Superconductor Nb-doped Bi 2 Se 3

Asaba, Tomoya; Lawson, B. J.; Tinsman, Colin; Chen, Lu; Corbae, Paul; Li, Gang; Qiu, Y.; Hor, Y. S.; Fu, Liang; Li, Lu

doi:10.1103/PhysRevX.7.011009

Title: Rotational Symmetry Breaking in a Trigonal Superconductor Nb-doped ${Bi}_{2} {Se}_{3}$

Journal Article · Fri Jan 27 00:00:00 EST 2017 · Physical Review. X

DOI:https://doi.org/10.1103/PhysRevX.7.011009· OSTI ID:1341323

Asaba, Tomoya; Lawson, B. J.; Tinsman, Colin; Chen, Lu; Corbae, Paul; Li, Gang; Qiu, Y.; Hor, Y. S.; Fu, Liang; Li, Lu

The search for unconventional superconductivity has been focused on materials with strong spin-orbit coupling and unique crystal lattices. Doped bismuth selenide (Bi₂Se₃) is a strong candidate, given the topological insulator nature of the parent compound and its triangular lattice. The coupling between the physical properties in the superconducting state and its underlying crystal symmetry is a crucial test for unconventional superconductivity. In this paper, we report direct evidence that the superconducting magnetic response couples strongly to the underlying trigonal crystal symmetry in the recently discovered superconductor with trigonal crystal structure, niobium (Nb)-doped Bi₂Se₃. As a result, the in-plane magnetic torque signal vanishes every 60°. More importantly, the superconducting hysteresis loop amplitude is enhanced along one preferred direction, spontaneously breaking the rotational symmetry. This observation indicates the presence of nematic order in the superconducting ground state of Nb-doped Bi₂Se₃.

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Research Organization:: Univ. of Michigan, Ann Arbor, MI (United States)

Sponsoring Organization:: USDOE Office of Science (SC)

Grant/Contract Number:: SC0008110

OSTI ID:: 1341323

Alternate ID(s):: OSTI ID: 1366695

Journal Information:: Physical Review. X, Journal Name: Physical Review. X Vol. 7 Journal Issue: 1; ISSN 2160-3308

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 136 works

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