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Updated: Aug 14, 2026
High Pressure Single Crystal Diffraction at PX^2
Published on: January 16, 2017
de Haas-van Alphen effect in single crystal MgB2
E A Yelland1, J R Cooper, A Carrington
1Interdisciplinary Research Centre in Superconductivity and Department of Physics, University of Cambridge, Madingley Road, Cambridge CB3 0HE, United Kingdom.
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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