Stress-induced nematicity in EuFe2As2 studied by Raman spectroscopy

Zhang, W. -L.; Sefat, Athena S.; Ding, H.; Richard, P.; Blumberg, G.

doi:10.1103/PhysRevB.94.014513

Title: Stress-induced nematicity in ${EuFe}_{2} {As}_{2}$ studied by Raman spectroscopy

Journal Article · Mon Jul 18 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.94.014513· OSTI ID:1360053

Zhang, W. -L. ^[1]; Sefat, Athena S. ^[2]; Ding, H. ^[3]; Richard, P. ^[3]; Blumberg, G. ^[4]

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
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Materials Science and Technology Division
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)
Rutgers Univ., Piscataway, NJ (United States). Dept. of Physics and Astronomy; National Inst. of Chemical Physics and Biophysics, Tallinn (Estonia)

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 C₄ 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 .

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Research Organization:: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); National Science Foundation (NSF)

Grant/Contract Number:: AC05-00OR22725; SC0005463

OSTI ID:: 1360053

Alternate ID(s):: OSTI ID: 1263722

Journal Information:: Physical Review B, Vol. 94, Issue 1; ISSN 2469-9950

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 5 works

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Pressure-Enhanced Transitional Transport of Electronic Fluids in EuFe2As2 Kwang-Hua, Chu R.; Li, Zhi-Hui Journal of Superconductivity and Novel Magnetism, Vol. 32, Issue 3 https://doi.org/10.1007/s10948-018-4753-1	journal	May 2018

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