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Title: Distinguishing between s + i d and s + i s pairing symmetries in multiband superconductors through spontaneous magnetization pattern induced by a defect

The symmetry of the pairing state in iron pnictide superconductor Ba 1-xK xFe 2As 2 is still controversial. At optimal doping (x ≈ 0.4), it is very likely s wave, but for x = 1 there are experimental and theoretical arguments for both s wave and d wave. Depending on the choice for x = 1 , intermediate s + i s and s + i d states have been proposed for intermediate doping 0.4 < x < 1 . In both states, the time-reversal symmetry is broken and a spontaneous magnetization is allowed. Here in this work we study a spontaneous magnetization induced by a nonmagnetic defect in the s + i s and s + i d states by using a perturbation theory and numerical calculations for the Ginzburg-Landau free energy functional. We show that the angular dependence of the magnetization is distinct in these two states due to the difference in symmetry properties of the order parameters. Our results indicate a possible way to distinguish between the s + i s and s + i d pairing symmetries in multiband superconductors.
Authors:
ORCiD logo [1] ;  [2] ;  [3]
  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  2. Univ. of Florida, Gainesville, FL (United States). Dept. of Physics
  3. Univ. of Minnesota, Minneapolis, MN (United States). Dept. of Physics
Publication Date:
Report Number(s):
LA-UR-16-24723
Journal ID: ISSN 2469-9950; PRBMDO
Grant/Contract Number:
AC52-06NA25396; SC0014402
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 6; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE Laboratory Directed Research and Development (LDRD) Program
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Material Science
OSTI Identifier:
1459626
Alternate Identifier(s):
OSTI ID: 1310845