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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2004     Display Documents

ID: 192801.0, 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
Audience: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
Document Type:Article
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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