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Title: NMR evidence for inhomogeneous nematic fluctuations in BaFe 2 ( As 1 - x P x ) 2

We present evidence for nuclear spin-lattice relaxation driven by glassy nematic fluctuations in isovalent P-doped BaFe 2As 2 single crystals. Both the 75As and 31P sites exhibit a stretched-exponential relaxation similar to the electron-doped systems. By comparing the hyperfine fields and the relaxation rates at these sites we find that the As relaxation cannot be explained solely in terms of magnetic spin fluctuations. We demonstrate that nematic fluctuations couple to the As nuclear quadrupolar moment and can explain the excess relaxation. Lastly, these results suggest that glassy nematic dynamics are a common phenomenon in the iron-based superconductors.
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  1. Univ. of California, Davis, CA (United States)
  2. IFW Dresden, Dresden (Germany)
  3. Stanford Univ., Stanford, CA (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States)
  4. Univ. of Minnesota, Minneapolis, MN (United States)
Publication Date:
Report Number(s):
LA-UR-15-28205; SLAC-PUB-16595
Journal ID: ISSN 0031-9007; PRLTAO
Grant/Contract Number:
FG52-09NA29464; AC02-76SF00515; SC0012336; AC52-06NA25396; NA0001842
Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 116; Journal Issue: 10; Journal ID: ISSN 0031-9007
American Physical Society (APS)
Research Org:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States); SLAC National Accelerator Lab., Menlo Park, CA (United States); Univ. of California, Davis, CA (United States)
Sponsoring Org:
USDOE National Nuclear Security Administration (NNSA)
Country of Publication:
United States
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; NMR; nuclear magnetic resonance; iron-based superconductor; nematic; MATSCI; 36 MATERIALS SCIENCE
OSTI Identifier:
Alternate Identifier(s):
OSTI ID: 1241398; OSTI ID: 1261079; OSTI ID: 1343601