Raman scattering study of spin-density-wave-induced anisotropic electronic properties in AFe2As2 ( A=Ca , Eu)

Zhang, W. -L.; Yin, Z. P.; Ignatov, A.; Bukowski, Z.; Karpinski, Janusz; Sefat, Athena S.; Ding, H.; Richard, P.; Blumberg, G.

doi:10.1103/PhysRevB.93.205106

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

Journal Article · Thu May 05 00:00:00 EDT 2016 · Physical Review B

DOI:https://doi.org/10.1103/PhysRevB.93.205106· OSTI ID:1362220

Zhang, W. -L. ^[1]; Yin, Z. P. ^[2]; Ignatov, A. ^[2]; Bukowski, Z. ^[3]; Karpinski, Janusz ^[4]; Sefat, Athena S. ^[5]; Ding, H. ^[6]; Richard, P. ^[6]; Blumberg, G. ^[7]

Chinese Academy of Sciences (CAS), Beijing (China); Rutgers Univ., Piscataway, NJ (United States)
Rutgers Univ., Piscataway, NJ (United States)
ETH Zurich (Switzerland); Polish Academy of Sciences (PAS), Wroclaw (Poland)
ETH Zurich (Switzerland)
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Chinese Academy of Sciences (CAS), Beijing (China); Collaborative Innovation Center of Quantum Matter, Beijing (China)
Rutgers Univ., Piscataway, NJ (United States); National Inst. of Chemical Physics and Biophysics, Tallinn (Estonia)

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 d_xz/yz orbitals in the broken-symmetry phase.

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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)

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1362220

Journal Information:: Physical Review B, Vol. 93, Issue 20; ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

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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)