skip to main content

DOE PAGESDOE PAGES

Title: Robust odd-parity superconductivity in the doped topological insulator Nb x Bi 2 Se 3

We present resistivity and magnetization measurements on proton-irradiated crystals demonstrating that the superconducting state in the doped topological insulator Nb xBi 2Se 3 (x = 0.25) is surprisingly robust against disorder-induced electron scattering. The superconducting transition temperature Tc decreases without indication of saturation with increasing defect concentration, and the corresponding scattering rates far surpass expectations based on conventional theory. The low-temperature variation of the London penetration depth Δλ(T) follows a power law [Δλ(T)~T 2] indicating the presence of symmetry-protected point nodes. Lastly, our results are consistent with the proposed robust nematic E u pairing state in this material.
Authors:
 [1] ;  [2] ;  [2] ;  [2] ;  [2] ;  [2] ;  [3] ;  [3] ;  [4] ;  [4] ;  [4] ;  [5] ;  [2]
  1. Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Notre Dame, Notre Dame, IN (United States)
  2. Argonne National Lab. (ANL), Argonne, IL (United States)
  3. Missouri Univ. of Science and Technology, Rolla, MO (United States)
  4. Western Michigan Univ., Kalamazoo MI (United States)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Publication Date:
Grant/Contract Number:
AC02-06CH11357
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 96; Journal Issue: 11; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22), Materials Sciences and Engineering Division; Swiss National Science Foundation (SNSF); National Science Foundation (NSF); USDOE
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1402061
Alternate Identifier(s):
OSTI ID: 1394020

Smylie, M. P., Willa, K., Claus, H., Snezhko, A., Martin, I., Kwok, W. -K., Qiu, Y., Hor, Y. S., Bokari, E., Niraula, P., Kayani, A., Mishra, V., and Welp, U.. Robust odd-parity superconductivity in the doped topological insulator NbxBi2Se3. United States: N. p., Web. doi:10.1103/PhysRevB.96.115145.
Smylie, M. P., Willa, K., Claus, H., Snezhko, A., Martin, I., Kwok, W. -K., Qiu, Y., Hor, Y. S., Bokari, E., Niraula, P., Kayani, A., Mishra, V., & Welp, U.. Robust odd-parity superconductivity in the doped topological insulator NbxBi2Se3. United States. doi:10.1103/PhysRevB.96.115145.
Smylie, M. P., Willa, K., Claus, H., Snezhko, A., Martin, I., Kwok, W. -K., Qiu, Y., Hor, Y. S., Bokari, E., Niraula, P., Kayani, A., Mishra, V., and Welp, U.. 2017. "Robust odd-parity superconductivity in the doped topological insulator NbxBi2Se3". United States. doi:10.1103/PhysRevB.96.115145. https://www.osti.gov/servlets/purl/1402061.
@article{osti_1402061,
title = {Robust odd-parity superconductivity in the doped topological insulator NbxBi2Se3},
author = {Smylie, M. P. and Willa, K. and Claus, H. and Snezhko, A. and Martin, I. and Kwok, W. -K. and Qiu, Y. and Hor, Y. S. and Bokari, E. and Niraula, P. and Kayani, A. and Mishra, V. and Welp, U.},
abstractNote = {We present resistivity and magnetization measurements on proton-irradiated crystals demonstrating that the superconducting state in the doped topological insulator NbxBi2Se3 (x = 0.25) is surprisingly robust against disorder-induced electron scattering. The superconducting transition temperature Tc decreases without indication of saturation with increasing defect concentration, and the corresponding scattering rates far surpass expectations based on conventional theory. The low-temperature variation of the London penetration depth Δλ(T) follows a power law [Δλ(T)~T2] indicating the presence of symmetry-protected point nodes. Lastly, our results are consistent with the proposed robust nematic Eu pairing state in this material.},
doi = {10.1103/PhysRevB.96.115145},
journal = {Physical Review B},
number = 11,
volume = 96,
place = {United States},
year = {2017},
month = {9}
}

Works referenced in this record:

Defect independence of the irreversibility line in proton-irradiated Y-Ba-Cu-O crystals
journal, August 1990
  • Civale, L.; Marwick, A. D.; McElfresh, M. W.
  • Physical Review Letters, Vol. 65, Issue 9, p. 1164-1167
  • DOI: 10.1103/PhysRevLett.65.1164