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

The search for unconventional superconductivity has been focused on materials with strong spin-orbit coupling and unique crystal lattices. Doped bismuth selenide (Bi 2Se 3) 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 Bi 2Se 3. 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 Bi 2Se 3.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [3] ;  [1]
  1. Univ. of Michigan, Ann Arbor, MI (United States)
  2. Missouri Univ. of Science and Technology, Rolla, MO (United States)
  3. Massachusetts Inst. of Technology (MIT), Cambridge, MA (United States)
Publication Date:
Grant/Contract Number:
SC0008110
Type:
Published Article
Journal Name:
Physical Review. X
Additional Journal Information:
Journal Volume: 7; Journal Issue: 1; Journal ID: ISSN 2160-3308
Publisher:
American Physical Society
Research Org:
Univ. of Michigan, Ann Arbor, MI (United States)
Sponsoring Org:
USDOE Office of Science (SC)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1341323
Alternate Identifier(s):
OSTI ID: 1366695

Asaba, Tomoya, Lawson, B. J., Tinsman, Colin, Chen, Lu, Corbae, Paul, Li, Gang, Qiu, Y., Hor, Y. S., Fu, Liang, and Li, Lu. Rotational Symmetry Breaking in a Trigonal Superconductor Nb-doped Bi2Se3. United States: N. p., Web. doi:10.1103/PhysRevX.7.011009.
Asaba, Tomoya, Lawson, B. J., Tinsman, Colin, Chen, Lu, Corbae, Paul, Li, Gang, Qiu, Y., Hor, Y. S., Fu, Liang, & Li, Lu. Rotational Symmetry Breaking in a Trigonal Superconductor Nb-doped Bi2Se3. United States. doi:10.1103/PhysRevX.7.011009.
Asaba, Tomoya, Lawson, B. J., Tinsman, Colin, Chen, Lu, Corbae, Paul, Li, Gang, Qiu, Y., Hor, Y. S., Fu, Liang, and Li, Lu. 2017. "Rotational Symmetry Breaking in a Trigonal Superconductor Nb-doped Bi2Se3". United States. doi:10.1103/PhysRevX.7.011009.
@article{osti_1341323,
title = {Rotational Symmetry Breaking in a Trigonal Superconductor Nb-doped Bi2Se3},
author = {Asaba, Tomoya and Lawson, B. J. and Tinsman, Colin and Chen, Lu and Corbae, Paul and Li, Gang and Qiu, Y. and Hor, Y. S. and Fu, Liang and Li, Lu},
abstractNote = {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.},
doi = {10.1103/PhysRevX.7.011009},
journal = {Physical Review. X},
number = 1,
volume = 7,
place = {United States},
year = {2017},
month = {1}
}

Works referenced in this record:

Colloquium: Topological insulators
journal, November 2010