TY - JOUR
T1 - Phonon density of states in MgB2
AU - Osborn, R.
AU - Goremychkin, E. A.
AU - Kolesnikov, A. I.
AU - Hinks, D. G.
PY - 2001
Y1 - 2001
N2 - 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 λ ∼ 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.
AB - 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 λ ∼ 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.
UR - http://www.scopus.com/inward/record.url?scp=85035291063&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.87.017005
DO - 10.1103/PhysRevLett.87.017005
M3 - Article
AN - SCOPUS:85035291063
SN - 0031-9007
VL - 87
JO - Physical Review Letters
JF - Physical Review Letters
IS - 1
ER -