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Title: NMR evidence for inhomogeneous glassy behavior driven by nematic fluctuations in iron arsenide superconductors

We present 75As nuclear magnetic resonance spin-lattice and spin-spin relaxation rate data in Ba(Fe 1–xCo x) 2As 2 and Ba(Fe 1–xCu x) 2As 2 as a function of temperature, doping, and magnetic field. The relaxation curves exhibit a broad distribution of relaxation rates, consistent with inhomogeneous glassy behavior up to 100 K. The doping and temperature response of the width of the dynamical heterogeneity is similar to that of the nematic susceptibility measured by elastoresistance measurements. In this study, we argue that quenched random fields which couple to the nematic order give rise to a nematic glass that is reflected in the spin dynamics.
Authors:
 [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [1] ;  [2] ;  [2] ;  [2] ;  [3] ;  [3] ;  [3] ;  [4] ;  [1]
  1. Univ. of California, Davis, CA (United States)
  2. Iowa State Univ., Ames, IA (United States)
  3. Florida State Univ., Tallahassee, FL (United States)
  4. IFW Dresden, Dresden (Germany)
Publication Date:
Report Number(s):
IS-J-8837; LA-UR-15-27695
Journal ID: ISSN 1098-0121; PRBMDO
Grant/Contract Number:
DMR1005393; DMR1157490; GR3330/2; AC02-07CH11358; AC52-06NA25396
Type:
Accepted Manuscript
Journal Name:
Physical Review. B, Condensed Matter and Materials Physics
Additional Journal Information:
Journal Volume: 92; Journal Issue: 16; Journal ID: ISSN 1098-0121
Publisher:
American Physical Society (APS)
Research Org:
Ames Laboratory (AMES), Ames, IA (United States); Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org:
USDOE; National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; material science
OSTI Identifier:
1227431
Alternate Identifier(s):
OSTI ID: 1223737; OSTI ID: 1321766