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Acoustic-phonon anomaly in MgB2
Linköping University, The Institute of Technology. Linköping University, Department of Physics, Chemistry and Biology, Theoretical Physics .ORCID iD: 0000-0002-6281-868X
2002 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 66, no 1Article in journal (Refereed) Published
Abstract [en]

Recent first-principles calculations of the phonon dispersion curves in MgB2 have suggested the presence of anomalies in some of the curves, particularly in the longitudinal acoustical (LA) branch in the Gamma to A direction. Similar behavior has been observed in numerous other superconductors with T-c's higher than those of standard electron-phonon BCS superconductors. Phenomenological calculations of the Gamma-->A LA dispersion based on both an acoustical plasmon and a "resonant polarization" mechanism are given here to emphasize the importance of these similarities.

Place, publisher, year, edition, pages
2002. Vol. 66, no 1
National Category
Engineering and Technology
URN: urn:nbn:se:liu:diva-47864DOI: 10.1103/PhysRevB.66.014513OAI: diva2:268760
Original Publication: RF Wood, Bo Sernelius and AL Chernyshev, Acoustic-phonon anomaly in MgB2, 2002, Physical Review B. Condensed Matter and Materials Physics, (66), 1. Copyright: American Physical Society Available from: 2009-10-11 Created: 2009-10-11 Last updated: 2013-10-02

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