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Effect of pressure, temperature, fluorine doping, and rare earth elements on the phonon density of states of LFeAsO studied by nuclear inelastic scattering

Sergueev, I. ; Hermann, R. P. ; Bessas, D. ; Pelzer, U. ; Angst, M. ; Schweika, Werner LU ; McGuire, M. A. ; Sefat, A. S. ; Sales, B. C. and Mandrus, D. , et al. (2013) In Physical Review B (Condensed Matter and Materials Physics) 87(6).
Abstract
We have performed systematic studies of the lattice dynamics in LFeAsO (L = La, Ce, Pr, Nd, Sm) in the parent and in the similar to 10% F-doped compounds as a function of pressure and temperature. We have found that the modifications in the partial Fe density of phonon states are mainly governed by the Fe-As bond length. The change of this bond length explains the change of the Fe density of phonon states above 25 meV. We further observe anomalies in the behavior of the phonon mode near 16 meV. In the parent phase, this mode softens anomalously upon cooling through the structural phase transition. Upon F doping, this mode hardens indicating a strong electron-phonon coupling. This suggests that the corresponding phonons play an important... (More)
We have performed systematic studies of the lattice dynamics in LFeAsO (L = La, Ce, Pr, Nd, Sm) in the parent and in the similar to 10% F-doped compounds as a function of pressure and temperature. We have found that the modifications in the partial Fe density of phonon states are mainly governed by the Fe-As bond length. The change of this bond length explains the change of the Fe density of phonon states above 25 meV. We further observe anomalies in the behavior of the phonon mode near 16 meV. In the parent phase, this mode softens anomalously upon cooling through the structural phase transition. Upon F doping, this mode hardens indicating a strong electron-phonon coupling. This suggests that the corresponding phonons play an important role in the competition between superconductivity and magnetism in these materials. DOI: 10.1103/PhysRevB.87.064302 (Less)
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organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Physical Review B (Condensed Matter and Materials Physics)
volume
87
issue
6
article number
064302
publisher
American Physical Society
external identifiers
  • wos:000315374100004
  • scopus:84874549778
ISSN
1098-0121
DOI
10.1103/PhysRevB.87.064302
language
English
LU publication?
yes
id
425c87a6-054e-450e-a44d-43b961977354 (old id 3671662)
date added to LUP
2016-04-01 13:07:36
date last changed
2022-02-26 19:28:35
@article{425c87a6-054e-450e-a44d-43b961977354,
  abstract     = {{We have performed systematic studies of the lattice dynamics in LFeAsO (L = La, Ce, Pr, Nd, Sm) in the parent and in the similar to 10% F-doped compounds as a function of pressure and temperature. We have found that the modifications in the partial Fe density of phonon states are mainly governed by the Fe-As bond length. The change of this bond length explains the change of the Fe density of phonon states above 25 meV. We further observe anomalies in the behavior of the phonon mode near 16 meV. In the parent phase, this mode softens anomalously upon cooling through the structural phase transition. Upon F doping, this mode hardens indicating a strong electron-phonon coupling. This suggests that the corresponding phonons play an important role in the competition between superconductivity and magnetism in these materials. DOI: 10.1103/PhysRevB.87.064302}},
  author       = {{Sergueev, I. and Hermann, R. P. and Bessas, D. and Pelzer, U. and Angst, M. and Schweika, Werner and McGuire, M. A. and Sefat, A. S. and Sales, B. C. and Mandrus, D. and Rueffer, R.}},
  issn         = {{1098-0121}},
  language     = {{eng}},
  number       = {{6}},
  publisher    = {{American Physical Society}},
  series       = {{Physical Review B (Condensed Matter and Materials Physics)}},
  title        = {{Effect of pressure, temperature, fluorine doping, and rare earth elements on the phonon density of states of LFeAsO studied by nuclear inelastic scattering}},
  url          = {{http://dx.doi.org/10.1103/PhysRevB.87.064302}},
  doi          = {{10.1103/PhysRevB.87.064302}},
  volume       = {{87}},
  year         = {{2013}},
}