Stress-induced nematicity in EuFe2As2 studied by Raman spectroscopy

doi:10.1103/PhysRevB.94.014513

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

Abstract

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:

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)

Publication Date:: 2016-07-18

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)

OSTI Identifier:: 1360053

Alternate Identifier(s):: OSTI ID: 1263722

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

Resource 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)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats


                    Zhang, W. -L., Sefat, Athena S., Ding, H., Richard, P., and Blumberg, G. Stress-induced nematicity in EuFe2As2 studied by Raman spectroscopy.  United States: N. p., 2016. 
        Web.  doi:10.1103/PhysRevB.94.014513.

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                    Zhang, W. -L., Sefat, Athena S., Ding, H., Richard, P., & Blumberg, G. Stress-induced nematicity in EuFe2As2 studied by Raman spectroscopy.  United States.  doi:10.1103/PhysRevB.94.014513.

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                    Zhang, W. -L., Sefat, Athena S., Ding, H., Richard, P., and Blumberg, G. Mon .  
        "Stress-induced nematicity in EuFe2As2 studied by Raman spectroscopy".  United States.  doi:10.1103/PhysRevB.94.014513.  https://www.osti.gov/servlets/purl/1360053.

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@article{osti_1360053,

  title        = {Stress-induced nematicity in EuFe2As2 studied by Raman spectroscopy},

  author       = {Zhang, W. -L. and Sefat, Athena S. and Ding, H. and Richard, P. and Blumberg, G.},

  abstractNote = {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 .},

  doi          = {10.1103/PhysRevB.94.014513},

  journal      = {Physical Review B},

  number       = 1,

  volume       = 94,

  place        = {United States},

  year         = {2016},

  month        = {7}

}

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DOI: 10.1103/PhysRevB.94.014513

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

Abstract

Citation Formats

Structural Quantum Criticality and Superconductivity in Iron-Based Superconductor Ba(Fe 1- x Co x ) 2 As 2 journal, February 2012

Symmetry-breaking orbital anisotropy observed for detwinned Ba(Fe1-xCox)2As2 above the spin density wave transition journal, April 2011

Raman-scattering study of K x Sr 1 − x Fe 2 As 2 ( x = 0.0 , 0.4 ) journal, August 2008

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Contrasting Spin Dynamics between Underdoped and Overdoped Ba ( Fe 1 − x Co x ) 2 As 2 journal, January 2010

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Neutron diffraction study of the magnetic and structural phase transitions in BaFe 2 As 2 journal, May 2009

Structural and magnetic phase transitions in the ternary iron arsenides SrFe 2 As 2 and EuFe 2 As 2 journal, October 2008

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Effect of Co Doping on the In-Plane Anisotropy in the Optical Spectrum of Underdoped Ba ( Fe 1 − x Co x ) 2 As 2 journal, November 2012

Effect of Uniaxial Strain on the Structural and Magnetic Phase Transitions in BaFe 2 As 2 journal, February 2012

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

Structural Quantum Criticality and Superconductivity in Iron-Based Superconductor Ba(Fe _{1- x} Co _x ) ₂ As ₂
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Symmetry-breaking orbital anisotropy observed for detwinned Ba(Fe1-xCox)2As2 above the spin density wave transition
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