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Phonon Density of States in MgB2

R. Osborn, E. A. Goremychkin, A. I. Kolesnikov, and D. G. Hinks
Phys. Rev. Lett. 87, 017005 – Published 15 June 2001
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Abstract

We report inelastic neutron scattering measurements of the phonon density of states in Mg11B2, 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 λ0.9. 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.

  • Received 2 March 2001

DOI:https://doi.org/10.1103/PhysRevLett.87.017005

©2001 American Physical Society

Authors & Affiliations

R. Osborn1, E. A. Goremychkin1,2, A. I. Kolesnikov2, and D. G. Hinks1

  • 1Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439
  • 2Intense Pulsed Neutron Source, Argonne National Laboratory, Argonne, Illinois 60439

See Also

Superconducting Serendipity in MgB_{2}

Geoff Brumfiel
Phys. Rev. Focus 8, 2 (2001)

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Vol. 87, Iss. 1 — 2 July 2001

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