Reference : Effect of pressure, temperature, fluorine doping, and rare earth elements on the phon...
Scientific journals : Article
Physical, chemical, mathematical & earth Sciences : Physics
http://hdl.handle.net/2268/163252
Effect of pressure, temperature, fluorine doping, and rare earth elements on the phonon density of states of LFeAsO studied by nuclear inelastic scattering
English
Sergueev, I. [European Synchrotron Radiat Facil, F-38043 Grenoble, France.]
Hermann, Raphael [Université de Liège - ULiège > > >]
Bessas, D. [European Synchrotron Radiat Facil, F-38043 Grenoble, France.]
Pelzer, U. [European Synchrotron Radiat Facil, F-38043 Grenoble, France.]
Angst, M. [Forschungszentrum Julich, JARA FIT, Julich Ctr Neutron Sci JCNS, D-52425 Julich, Germany.]
Schweika, W. [Forschungszentrum Julich, JARA FIT, Julich Ctr Neutron Sci JCNS, D-52425 Julich, Germany.]
McGuire, M. A. [Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.]
Sefat, A. S. [Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.]
Sales, B. C. [Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.]
Mandrus, D. [Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA.]
Rueffer, R. [European Synchrotron Radiat Facil, F-38043 Grenoble, France.]
2013
Physical Review. B, Condensed Matter and Materials Physics
Amer Physical Soc
87
6
064302-9
Yes (verified by ORBi)
International
1098-0121
1550-235X
College Pk
MD
[en] 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
Helmholtz-University Young Investigator Group "Lattice Dynamic in Emerging Functional Materials" [VH NG-407] ; Helmholtz-University Young Investigator Group "Complex Ordering Phenomena in Multifunctional Oxides" [VH NG-510] ; US Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division
http://hdl.handle.net/2268/163252
10.1103/PhysRevB.87.064302
The European Synchrotron Radiation Facility is acknowledged for provision of synchrotron radiation beamtime and facility at beamlines ID18 and ID22N. R.H. acknowledges support from the Helmholtz-University Young Investigator Group VH NG-407 "Lattice Dynamic in Emerging Functional Materials." M.A. acknowledges support from the Helmholtz-University Young Investigator Group VH NG-510 "Complex Ordering Phenomena in Multifunctional Oxides." Research at ORNL was supported by the US Department of Energy, Basic Energy Sciences, Materials Sciences and Engineering Division.

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