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  • Accepted Manuscript: Stress-induced nematicity in EuFe 2 As 2 studied by Raman spectroscopy

Title: Stress-induced nematicity in EuFe 2 As 2 studied by Raman spectroscopy

Here, we use polarized Raman scattering to study the structural phase transition in EuFe 2 As 2 , the parent compound of the 122-ferropnictide superconductors. The in-plane lattice anisotropy is characterized by measurements of the side surface with different strains induced by different preparation methods. We also show that while a fine surface polishing leaves the samples free of residual internal strain, in which case the onset of the C 4 symmetry breaking is observed at the nominal structural phase transition temperature T S , cutting the side surface induces a permanent fourfold rotational symmetry breaking spanning tens of degrees above T S .
Authors:
 [1] ;  [2] ;  [3] ;  [3] ;  [4]
+ Show Author Affiliations
  1. Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics and Inst. of Physics; Rutgers Univ., Piscataway, NJ (United States). Dept. of Physics and Astronomy
  2. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
  3. Chinese Academy of Sciences (CAS), Beijing (China). Beijing National Lab. for Condensed Matter Physics and Inst. of Physics; Collaborative Innovation Center of Quantum Matter, Beijing (China)
  4. Rutgers Univ., Piscataway, NJ (United States). Dept. of Physics and Astronomy; National Inst. of Chemical Physics and Biophysics, Tallinn (Estonia)
Publication Date:
Grant/Contract Number:
AC05-00OR22725; SC0005463
Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 94; Journal Issue: 1; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); National Science Foundation (NSF)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1360053
Alternate Identifier(s):
OSTI ID: 1263722