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Title: Raman scattering study of spin-density-wave-induced anisotropic electronic properties in A Fe 2 As 2 ( A = Ca , Eu)

Abstract

We present a polarization-resolved and temperature-dependent Raman scattering study of AFe 2As 2 (A = Ca, Eu). In the spin-density-wave phase, spectral weight redistribution is observed in the fully symmetric and nonsymmetric scattering channels at different energies. An anisotropic Raman response is observed in the fully symmetric channel in spontaneously detwinned CaFe 2As 2 samples. We calculate the orbital-resolved electronic structures using a combination of density functional theory and dynamical mean field theory. We identify the electronic transitions corresponding to these two spectral features and find that the anisotropic Raman response originates from the lifted degeneracy of the d xz/yz orbitals in the broken-symmetry phase.

Authors:
 [1];  [2];  [2];  [3];  [4];  [5];  [6];  [6];  [7]
  1. Chinese Academy of Sciences (CAS), Beijing (China); Rutgers Univ., Piscataway, NJ (United States)
  2. Rutgers Univ., Piscataway, NJ (United States)
  3. ETH Zurich (Switzerland); Polish Academy of Sciences (PAS), Wroclaw (Poland)
  4. ETH Zurich (Switzerland)
  5. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
  6. Chinese Academy of Sciences (CAS), Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
  7. Rutgers Univ., Piscataway, NJ (United States); National Inst. of Chemical Physics and Biophysics, Tallinn (Estonia)
Publication Date:
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)
OSTI Identifier:
1362220
DOE Contract Number:  
AC05-00OR22725
Resource Type:
Journal Article
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 93; Journal Issue: 20; Journal ID: ISSN 2469-9950
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS

Citation Formats

Zhang, W. -L., Yin, Z. P., Ignatov, A., Bukowski, Z., Karpinski, Janusz, Sefat, Athena S., Ding, H., Richard, P., and Blumberg, G. Raman scattering study of spin-density-wave-induced anisotropic electronic properties in AFe2As2 ( A=Ca , Eu). United States: N. p., 2016. Web. doi:10.1103/PhysRevB.93.205106.
Zhang, W. -L., Yin, Z. P., Ignatov, A., Bukowski, Z., Karpinski, Janusz, Sefat, Athena S., Ding, H., Richard, P., & Blumberg, G. Raman scattering study of spin-density-wave-induced anisotropic electronic properties in AFe2As2 ( A=Ca , Eu). United States. doi:10.1103/PhysRevB.93.205106.
Zhang, W. -L., Yin, Z. P., Ignatov, A., Bukowski, Z., Karpinski, Janusz, Sefat, Athena S., Ding, H., Richard, P., and Blumberg, G. Thu . "Raman scattering study of spin-density-wave-induced anisotropic electronic properties in AFe2As2 ( A=Ca , Eu)". United States. doi:10.1103/PhysRevB.93.205106.
@article{osti_1362220,
title = {Raman scattering study of spin-density-wave-induced anisotropic electronic properties in AFe2As2 ( A=Ca , Eu)},
author = {Zhang, W. -L. and Yin, Z. P. and Ignatov, A. and Bukowski, Z. and Karpinski, Janusz and Sefat, Athena S. and Ding, H. and Richard, P. and Blumberg, G.},
abstractNote = {We present a polarization-resolved and temperature-dependent Raman scattering study of AFe2As2 (A = Ca, Eu). In the spin-density-wave phase, spectral weight redistribution is observed in the fully symmetric and nonsymmetric scattering channels at different energies. An anisotropic Raman response is observed in the fully symmetric channel in spontaneously detwinned CaFe2As2 samples. We calculate the orbital-resolved electronic structures using a combination of density functional theory and dynamical mean field theory. We identify the electronic transitions corresponding to these two spectral features and find that the anisotropic Raman response originates from the lifted degeneracy of the dxz/yz orbitals in the broken-symmetry phase.},
doi = {10.1103/PhysRevB.93.205106},
journal = {Physical Review B},
issn = {2469-9950},
number = 20,
volume = 93,
place = {United States},
year = {2016},
month = {5}
}

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