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Phonon density of states in MgB2

By R. Osborn, E.A. Goremychkin, A.I. Kolesnikov and D.G. Hinks

Abstract

We report inelastic neutron scattering measurements of the phonon density of states in Mg 11B2, which has a superconducting transition at 39.2 K. The acoustic phonons extend in energy to 36 meV, and there are highly dispersive optic branches peaking at 54, 78, 89, and 97 meV. A simple Born–von Kàrmàn model reproduces the mode energies, and provides an estimate of the electron-phonon coupling of ??0.9. Furthermore, the estimated boron and magnesium contributions to the isotope effect are in qualitative agreement with experiment. The data confirm that a conventional phonon mechanism, with moderately strong electron-phonon coupling, can explain the observed superconductivity

Topics: QC
Year: 2001
OAI identifier: oai:eprints.soton.ac.uk:35540
Provided by: e-Prints Soton
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