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

Abstract

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.

Authors:
 [1];  [1];  [1];  [1];  [1];  [2];  [3];  [3];  [4];  [1]
  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:
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)
OSTI Identifier:
1255258
Alternate Identifier(s):
OSTI ID: 1241398; OSTI ID: 1261079; OSTI ID: 1343601
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
Resource Type:
Journal Article: Accepted Manuscript
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 116; Journal Issue: 10; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; NMR; nuclear magnetic resonance; iron-based superconductor; nematic; MATSCI; 36 MATERIALS SCIENCE

Citation Formats

Dioguardi, A. P., Kissikov, T., Lin, C. H., Shirer, K. R., Lawson, M. M., Grafe, H. -J., Chu, J. -H., Fisher, I. R., Fernandes, R. M., and Curro, N. J. NMR evidence for inhomogeneous nematic fluctuations in BaFe2(As1-xPx)2. United States: N. p., 2016. Web. doi:10.1103/PhysRevLett.116.107202.
Dioguardi, A. P., Kissikov, T., Lin, C. H., Shirer, K. R., Lawson, M. M., Grafe, H. -J., Chu, J. -H., Fisher, I. R., Fernandes, R. M., & Curro, N. J. NMR evidence for inhomogeneous nematic fluctuations in BaFe2(As1-xPx)2. United States. doi:10.1103/PhysRevLett.116.107202.
Dioguardi, A. P., Kissikov, T., Lin, C. H., Shirer, K. R., Lawson, M. M., Grafe, H. -J., Chu, J. -H., Fisher, I. R., Fernandes, R. M., and Curro, N. J. Thu . "NMR evidence for inhomogeneous nematic fluctuations in BaFe2(As1-xPx)2". United States. doi:10.1103/PhysRevLett.116.107202. https://www.osti.gov/servlets/purl/1255258.
@article{osti_1255258,
title = {NMR evidence for inhomogeneous nematic fluctuations in BaFe2(As1-xPx)2},
author = {Dioguardi, A. P. and Kissikov, T. and Lin, C. H. and Shirer, K. R. and Lawson, M. M. and Grafe, H. -J. and Chu, J. -H. and Fisher, I. R. and Fernandes, R. M. and Curro, N. J.},
abstractNote = {We present evidence for nuclear spin-lattice relaxation driven by glassy nematic fluctuations in isovalent P-doped BaFe2As2 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.},
doi = {10.1103/PhysRevLett.116.107202},
journal = {Physical Review Letters},
number = 10,
volume = 116,
place = {United States},
year = {Thu Mar 10 00:00:00 EST 2016},
month = {Thu Mar 10 00:00:00 EST 2016}
}

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