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Title: Local nematic susceptibility in stressed BaFe 2 As 2 from NMR electric field gradient measurements

Journal Article · · Physical Review B
 [1];  [2];  [1];  [1];  [3];  [3];  [3];  [3];  [3];  [4];  [1];  [1];  [1]
  1. Univ. of California, Davis, CA (United States). Dept. of Physics
  2. TU Dresden, Dresden (Germany). Inst. for Solid State Physics
  3. Ames Lab. and Iowa State Univ., Ames, IA (United States). Dept. of Physics and Astronomy
  4. Univ. of Minnesota, Minneapolis, MN (United States). School of Physics and Astronomy

The electric field gradient (EFG) tensor at the 75As site couples to the orbital occupations of the As p orbitals and is a sensitive probe of local nematicity in BaFe2As2. We use nuclear magnetic resonance to measure the nuclear quadrupolar splittings and find that the EFG asymmetry responds linearly to the presence of a strain field in the paramagnetic phase. We extract the nematic susceptibility from the slope of this linear response as a function of temperature and find that it diverges near the structural transition, in agreement with other measures of the bulk nematic susceptibility. Our work establishes an alternative method to extract the nematic susceptibility which, in contrast to transport methods, can be extended inside the superconducting state.

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; National Science Foundation (NSF); German Research Foundation (DFG)
Grant/Contract Number:
DMR-1506961; DMR-1607139; NA0002908; SC0012336; AC02-07CH11358
OSTI ID:
1415857
Alternate ID(s):
OSTI ID: 1414039; OSTI ID: 1464798
Report Number(s):
IS-J-9544; PRBMDO; TRN: US1800860
Journal Information:
Physical Review B, Vol. 96, Issue 24; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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Figures / Tables (4)