MPI für Festkörperforschung / FKF Publikationen 2004 |
|Temperature-dependent phonon lifetimes in lead investigated with neutron-resonance spin-echo spectroscopy|
|Authors:||Habicht, K.; Golub, R.; Mezei, F.; Keimer, B.; Keller, T.|
|Date of Publication (YYYY-MM-DD):||2004|
|Title of Journal:||Physical Review B|
|Issue / Number:||10|
|Sequence Number of Article:||104301|
|Review Status:||not specified|
|Abstract / Description:||An experimental study of phonon lifetimes in lead using a novel
high-resolution neutron spectrometer is presented. The spectrometer
combines the neutron-resonance spin-echo and the three-axis techniques.
Transverse-acoustic phonon modes in the low-q limit along the
high-symmetry directions are investigated at temperatures between 5-300
K. We apply an analytical approach based on a Gaussian approximation of
the instrumental resolution function to separate intrinsic lifetimes
from artifactual damping due to sample mosaicity and curvature of the
four-dimensional dispersion surface. Observed linewidths are
significantly lower than predicted by a theoretical model of anharmonic
lattice dynamics based on a force-constant parametrization of the
interatomic potential. In the high-symmetry directions the q dependence
of the linewidth is found to be linear. No change in lifetime is
observed at the superconducting transition temperature T-C.
|External Publication Status:||published|
|Communicated by:||Michaela Asen-Palmer|
|Affiliations:||MPI für Festkörperforschung|
|External Affiliations:||Hahn Meitner Inst Berlin GmbH, D-14109 Berlin, Germany.
; Tech Univ Darmstadt, Inst Festkorperphys, D-64289 Darmstadt, Germany.
; Max Planck Inst Solid State Res, D-70569 Stuttgart, Germany.
; FRM II, D-85747 Garching, Germany.
|Identifiers:||ISI:000220813500036 [ID No:1] |
ISSN:1098-0121 [ID No:2]
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