Interplay of lattice, electronic, and spin degrees of freedom in detwinned : A Raman scattering study
Abstract
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 allmore »
- Authors:
-
- 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.
- Publication Date:
- Research Org.:
- SLAC National Accelerator Laboratory (SLAC), Menlo Park, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- 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. https://doi.org/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. https://doi.org/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 = {Tue Aug 07 00:00:00 EDT 2018},
month = {Tue Aug 07 00:00:00 EDT 2018}
}
Web of Science
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