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Phonon density of states in MgB2

Phonon density of states in MgB2
Phonon density of states in MgB2
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.
superconductivity, phonon density of states, MgB2, inelastic neutron scattering
0031-9007
017005-[4pp]
Osborn, R.
12b613a4-baca-43c0-835f-9dc31a5e6a90
Goremychkin, E.A.
37f2b8ac-14dc-4957-9864-b490d9853451
Kolesnikov, A.I.
fd6e161c-7872-4205-946d-af656bf7c134
Hinks, D.G.
2998d1a8-2739-4067-becd-07a13d4834f2
Osborn, R.
12b613a4-baca-43c0-835f-9dc31a5e6a90
Goremychkin, E.A.
37f2b8ac-14dc-4957-9864-b490d9853451
Kolesnikov, A.I.
fd6e161c-7872-4205-946d-af656bf7c134
Hinks, D.G.
2998d1a8-2739-4067-becd-07a13d4834f2

Osborn, R., Goremychkin, E.A., Kolesnikov, A.I. and Hinks, D.G. (2001) Phonon density of states in MgB2. Physical Review Letters, 87 (1), 017005-[4pp]. (doi:10.1103/PhysRevLett.87.017005).

Record type: Article

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.

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Submitted date: 2 March 2001
Published date: 2 July 2001
Keywords: superconductivity, phonon density of states, MgB2, inelastic neutron scattering

Identifiers

Local EPrints ID: 35540
URI: http://eprints.soton.ac.uk/id/eprint/35540
ISSN: 0031-9007
PURE UUID: f65734be-d174-4b4c-9eec-a9ad60b52635

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Date deposited: 18 May 2006
Last modified: 26 Apr 2022 17:27

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Contributors

Author: R. Osborn
Author: E.A. Goremychkin
Author: A.I. Kolesnikov
Author: D.G. Hinks

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