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

Abstract

We report results of Raman scattering experiments on twin-free BaFe 2 As 2 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 A 1g mode. Each of the two Eg phonons in the tetragonal phase is observed to split into a B 2g and a B 3g 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 E g 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 themore » corresponding reconstruction of the electronic bands at all energies.« less

Authors:
 [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.
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)
OSTI Identifier:
1468723
Alternate Identifier(s):
OSTI ID: 1463206
Grant/Contract Number:  
SPP 1458; III45018; 56267076; 57142964; AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Physical Review B
Additional Journal Information:
Journal Volume: 98; Journal Issue: 7; 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

Baum, A., Li, Ying, Tomić, M., Lazarević, N., Jost, D., Löffler, F., Muschler, B., Böhm, T., Chu, J. -H., Fisher, I. R., Valentí, R., Mazin, I. I., and Hackl, R. Interplay of lattice, electronic, and spin degrees of freedom in detwinned BaFe2As2 : A Raman scattering study. United States: N. p., 2018. Web. doi:10.1103/physrevb.98.075113.
Baum, A., Li, Ying, Tomić, M., Lazarević, N., Jost, D., Löffler, F., Muschler, B., Böhm, T., Chu, J. -H., Fisher, I. R., Valentí, R., Mazin, I. I., & Hackl, R. Interplay of lattice, electronic, and spin degrees of freedom in detwinned BaFe2As2 : A Raman scattering study. United States. doi:10.1103/physrevb.98.075113.
Baum, A., Li, Ying, Tomić, M., Lazarević, N., Jost, D., Löffler, F., Muschler, B., Böhm, T., Chu, J. -H., Fisher, I. R., Valentí, R., Mazin, I. I., and Hackl, R. Tue . "Interplay of lattice, electronic, and spin degrees of freedom in detwinned BaFe2As2 : A Raman scattering study". United States. doi:10.1103/physrevb.98.075113. https://www.osti.gov/servlets/purl/1468723.
@article{osti_1468723,
title = {Interplay of lattice, electronic, and spin degrees of freedom in detwinned BaFe2As2 : A Raman scattering study},
author = {Baum, A. and Li, Ying and Tomić, M. and Lazarević, N. and Jost, D. and Löffler, F. and Muschler, B. and Böhm, T. and Chu, J. -H. and Fisher, I. R. and Valentí, R. and Mazin, I. I. and Hackl, R.},
abstractNote = {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.},
doi = {10.1103/physrevb.98.075113},
journal = {Physical Review B},
number = 7,
volume = 98,
place = {United States},
year = {2018},
month = {8}
}

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