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Title: Widespread orthorhombic fluctuations in the ( Sr , Na ) Fe 2 As 2 family of superconductors

Abstract

Here, we report comprehensive pair distribution function measurements of the hole-doped iron-based superconductor system Sr 1–xNa xFe 2As 2. Structural refinements performed as a function of temperature and length scale reveal orthorhombic distortions of the instantaneous local structure across a large region of the phase diagram possessing average tetragonal symmetry, indicative of fluctuating nematicity. These nematic fluctuations are present up to high doping levels (x ≳ 0.48, near optimal superconductivity) and high temperatures (above room temperature for x = 0, decreasing to 150 K for x = 0.48), with a typical length scale of 1–3 nm. This work highlights the ubiquity of nematic fluctuations in a representative iron-based superconductor and provides important details about the evolution of these fluctuations across the phase diagram.

Authors:
 [1]; ORCiD logo [2];  [3];  [4];  [5];  [6];  [3];  [3];  [4];  [7]
  1. Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Brigham Young Univ., Provo, UT (United States)
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  3. Argonne National Lab. (ANL), Argonne, IL (United States)
  4. Northern Illinois Univ., DeKalb, IL (United States); Argonne National Lab. (ANL), Argonne, IL (United States)
  5. Univ. of California, Berkeley, CA (United States); Rice Univ., Houston, TX (United States)
  6. Univ. of California, Berkeley, CA (United States)
  7. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1488566
Alternate Identifier(s):
OSTI ID: 1479452; OSTI ID: 1484107; OSTI ID: 1492129
Grant/Contract Number:  
AC02-06CH11357; AC02-05CH11231; AC05-00OR22725; AC02-05-CH11231; SC0012704
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 18; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats

Frandsen, Benjamin A., Taddei, Keith M., Bugaris, Daniel E., Stadel, Ryan, Yi, Ming, Acharya, Arani, Osborn, Raymond, Rosenkranz, Stephan, Chmaissem, Omar, and Birgeneau, Robert J. Widespread orthorhombic fluctuations in the (Sr,Na)Fe2As2 family of superconductors. United States: N. p., 2018. Web. doi:10.1103/physRevB.98.180505.
Frandsen, Benjamin A., Taddei, Keith M., Bugaris, Daniel E., Stadel, Ryan, Yi, Ming, Acharya, Arani, Osborn, Raymond, Rosenkranz, Stephan, Chmaissem, Omar, & Birgeneau, Robert J. Widespread orthorhombic fluctuations in the (Sr,Na)Fe2As2 family of superconductors. United States. doi:10.1103/physRevB.98.180505.
Frandsen, Benjamin A., Taddei, Keith M., Bugaris, Daniel E., Stadel, Ryan, Yi, Ming, Acharya, Arani, Osborn, Raymond, Rosenkranz, Stephan, Chmaissem, Omar, and Birgeneau, Robert J. Mon . "Widespread orthorhombic fluctuations in the (Sr,Na)Fe2As2 family of superconductors". United States. doi:10.1103/physRevB.98.180505. https://www.osti.gov/servlets/purl/1488566.
@article{osti_1488566,
title = {Widespread orthorhombic fluctuations in the (Sr,Na)Fe2As2 family of superconductors},
author = {Frandsen, Benjamin A. and Taddei, Keith M. and Bugaris, Daniel E. and Stadel, Ryan and Yi, Ming and Acharya, Arani and Osborn, Raymond and Rosenkranz, Stephan and Chmaissem, Omar and Birgeneau, Robert J.},
abstractNote = {Here, we report comprehensive pair distribution function measurements of the hole-doped iron-based superconductor system Sr1–xNaxFe2As2. Structural refinements performed as a function of temperature and length scale reveal orthorhombic distortions of the instantaneous local structure across a large region of the phase diagram possessing average tetragonal symmetry, indicative of fluctuating nematicity. These nematic fluctuations are present up to high doping levels (x ≳ 0.48, near optimal superconductivity) and high temperatures (above room temperature for x = 0, decreasing to 150 K for x = 0.48), with a typical length scale of 1–3 nm. This work highlights the ubiquity of nematic fluctuations in a representative iron-based superconductor and provides important details about the evolution of these fluctuations across the phase diagram.},
doi = {10.1103/physRevB.98.180505},
journal = {Physical Review B},
number = 18,
volume = 98,
place = {United States},
year = {2018},
month = {11}
}

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