Interplay of lattice, electronic, and spin degrees of freedom in detwinned BaFe2As2 : A Raman scattering study

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.

doi:10.1103/physrevb.98.075113

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

Journal Article · 07 August 2018 · Physical Review. B

DOI: https://doi.org/10.1103/physrevb.98.075113 · OSTI ID:1468723

Baum, A. ^[1]; Li, Ying ^[2]; Tomić, M. ^[2]; Lazarević, N. ^[3]; Jost, D. ^[1]; Löffler, F. ^[1]; Muschler, B. ^[1]; Böhm, T. ^[1]; Chu, J. -H. ^[4]; Fisher, I. R. ^[5]; Valentí, R. ^[2]; Mazin, I. I. ^[6]; Hackl, R. ^[7]

Bavarian Academy of Sciences and Humanities, Garching (Germany). Walther Meissner Inst.; Technische Univ. Munchen, Garching (Germany). Fakultät fur Physik
Goethe Univ., Frankfurt (Germany). Inst. für Theoretische Physik
Univ. of Belgrade, Belgrade (Serbia). Center for Solid State Physics and New Materials, Inst. of Physics Belgrade
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
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
Naval Research Lab. (NRL), Washington, DC (United States)
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 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 the corresponding reconstruction of the electronic bands at all energies.

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Research Organization:: SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC02-76SF00515

OSTI ID:: 1468723

Journal Information:: Physical Review. B, Journal Name: Physical Review. B Journal Issue: 7 Vol. 98; ISSN 2469-9950; ISSN PRBMDO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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