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
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
2 July 2001
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), .
(doi:10.1103/PhysRevLett.87.017005).
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: 15 Mar 2024 07:52
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Author:
R. Osborn
Author:
E.A. Goremychkin
Author:
A.I. Kolesnikov
Author:
D.G. Hinks
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