ISSN:
1434-6036
Keywords:
PACS. 74.70.-b Superconducting materials (excluding high-Tc compounds) – 74.25.Kc Phonons – 78.70.Nx Neutron inelastic scattering
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: We provide here experimental data on the phonon density-of-states of MgB2 obtained by the inelastic neutron scattering technique. The measurements were performed for the natural boron-based magnesium diboride with use of a time-of-flight neutron spectrometer. Several phonon bands were observed in the phonon spectrum at energies of about 33, 55, 82 and 99 meV. We show that the cut-off energy of the density-of-states occurs at around 105 meV which is much higher than expected so far from heat-capacity data and partially explains the high T c value observed for MgB2. The characteristic phonon energies are indicative of an intermediate coupling regime in this compound. We conclude that a much needed neutron experiment aimed at the study of the isotopic effect in the phonon density-of-states of MgB2 is conceivable.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100510170152
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