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  • Title: de Haas-van Alphen effect in single crystal MgB2.
    Author: Yelland EA, Cooper JR, Carrington A, Hussey NE, Meeson PJ, Lee S, Yamamoto A, Tajima S.
    Journal: Phys Rev Lett; 2002 May 27; 88(21):217002. PubMed ID: 12059494.
    Abstract:
    We report observations of quantum oscillations in single crystals of the high temperature superconductor MgB2. Three de Haas-van Alphen frequencies are clearly resolved. Comparison with band structure calculations strongly suggests that two of these come from a single warped Fermi surface tube along the c direction, and that the third arises from cylindrical sections of an in-plane honeycomb network. The measured values of the effective mass range from (0.44-0.68)m(e). By comparing these to calculated band masses, we find that the electron-phonon coupling strength lambda is a factor of approximately 3 larger for the c-axis tube orbits than for the in-plane network orbit, in accord with recent microscopic calculations.
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