TY  - JOUR
AU  - Mittal, R.
AU  - Zbiri, M.
AU  - Rols, S.
AU  - Su, Y.
AU  - Xiao, Y.
AU  - Chaplot, S.L.
AU  - Schober, H.
AU  - Johnson, M.
AU  - Chatterji, T.
AU  - Matsuishi, S.
AU  - Hosono, H.
AU  - Brückel, T.
TI  - Phonon Dynamics in Parent and Superconducting FeAs Compounds
JO  - Chinese journal of physics
VL  - 49
SN  - 0577-9073
CY  - Taipei
PB  - Physical Society of the Republic of China
M1  - PreJuSER-15735
SP  - 403 - 413
PY  - 2011
N1  - Record converted from VDB: 12.11.2012
AB  - The comparison of the phonon spectra of the parent MFe2As2 (M = Ba, Ca, Sr) and MFeAsF (M = Ca, Sr) compounds show a very strong renormalization in the lower and intermediate frequency part of the vibrations. Mass effects and lattice contraction cannot solely explain these changes. Further, the measurement of temperature dependence of phonon density of states across the magnetic/structural phase transition temperature indicates that softening of low energy modes in the paramagnetic state of these compounds may be due to the interaction of phonons with electron or short-range spin fluctuations in the normal state of the superconducting compound as well as in the parent compound. Detailed lattice dynamical calculations are carried out to analyze the experimental data.
KW  - J (WoSType)
LB  - PUB:(DE-HGF)16
UR  - <Go to ISI:>//WOS:000286490100049
UR  - https://juser.fz-juelich.de/record/15735
ER  -