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Title: Interplay of lattice, electronic, and spin degrees of freedom in detwinned BaFe 2 As 2 : A Raman scattering study

Journal Article · · Physical Review. B
 [1];  [2];  [2];  [3];  [1];  [1];  [1];  [1];  [4];  [5];  [2];  [6];  [7]
  1. Bavarian Academy of Sciences and Humanities, Garching (Germany). Walther Meissner Inst.; Technische Univ. Munchen, Garching (Germany). Fakultät fur Physik
  2. Goethe Univ., Frankfurt (Germany). Inst. für Theoretische Physik
  3. Univ. of Belgrade, Belgrade (Serbia). Center for Solid State Physics and New Materials, Inst. of Physics Belgrade
  4. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials & Dept. of Applied Physics; Univ. of Washington, Seattle, WA (United States). Dept. of Physics
  5. SLAC National Accelerator Lab., Menlo Park, CA (United States). Stanford Institute for Materials and Energy Science (SIMES); Stanford Univ., CA (United States). Geballe Lab. for Advanced Materials & Dept. of Applied Physics
  6. Naval Research Lab. (NRL), Washington, DC (United States)
  7. Bavarian Academy of Sciences and Humanities, Garching (Germany). Walther Meissner Inst.

We report results of Raman scattering experiments on twin-free BaFe2 As2 with the main focus placed on understanding the influence of electronic and spin degrees of freedom on the lattice dynamics. In particular, we scrutinize the Eg modes and the As A1g mode. Each of the two Eg phonons in the tetragonal phase is observed to split into a B2g and a B3g mode upon entering the orthorhombic stripe-magnetic phase. The splitting amounts to approximately 10 cm-1 and less than 5 cm-1 for the low- and the high-energy Eg mode, respectively. The detailed study of the fully symmetric As mode using parallel incident and outgoing photon polarizations along either the antiferromagnetic or the ferromagnetic Fe-Fe direction reveals an anisotropic variation of the spectral weight with the energy of the exciting laser indicating a polarization-dependent resonance effect. Along with the experiments we present results from density functional theory calculations of the phonon eigenvectors, the dielectric function, and the Raman tensor elements. The comparison of theory and experiment indicates that (i) orbital-selective electronic correlations are crucial to understand the lattice dynamics and (ii) all phonon anomalies originate predominantly from the magnetic ordering and the corresponding reconstruction of the electronic bands at all energies.

Research Organization:
SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
SPP 1458; III45018; 56267076; 57142964; AC02-76SF00515
OSTI ID:
1468723
Alternate ID(s):
OSTI ID: 1463206
Journal Information:
Physical Review. B, Vol. 98, Issue 7; ISSN 2469-9950
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 11 works
Citation information provided by
Web of Science

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Cited By (6)

Symmetries of modes in Ni 3 V 2 O 8 : Polarized Raman spectroscopy and ab initio phonon calculations journal January 2019
Temperature-Dependent Raman Study of Nanostructured and Multifunctional Materials journal March 2019
Probing the reconstructed Fermi surface of antiferromagnetic BaFe2As2 in one domain journal July 2019
Frustrated spin order and stripe fluctuations in FeSe journal February 2019
Probing the reconstructed Fermi surface of antiferromagnetic $BaFe_{2}As_{2}$ in one domain text January 2019
Frustrated spin order and stripe fluctuations in FeSe text January 2019

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