The phonon lifetime of longitudinal and transverse phonons along the [100] direction in tantalum has been measured at 1.2, 4.2 and 6 K and room temperature by neutron inelastic scattering. An anomalous softening of acoustic phonons with energies between 6 and 12 meV is observed when the temperature is lowered from 4.2 to 1.2 K. Such a softening is an indication that a lattice instability can be present at low temperatures in otherwise stable transition metals.
Phonon softening in tantalum below 4.2 K
SACCHETTI, Francesco;PETRILLO, Caterina
1992
Abstract
The phonon lifetime of longitudinal and transverse phonons along the [100] direction in tantalum has been measured at 1.2, 4.2 and 6 K and room temperature by neutron inelastic scattering. An anomalous softening of acoustic phonons with energies between 6 and 12 meV is observed when the temperature is lowered from 4.2 to 1.2 K. Such a softening is an indication that a lattice instability can be present at low temperatures in otherwise stable transition metals.File in questo prodotto:
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