We present an experimental study of the de Haas-van Alphen effect in single crystals of MgB2, using a piezo-resistive torque technique. Three quasi-particle orbits were observed. Two originate from a single warped Fermi surface tube along the c direction, and the third from a cylindrical section of an in-plane honeycomb network. The quasi-particle effective masses on these orbits were determined and compared to band structure calculations. From this we deduce that the electron-phonon coupling strength λ, is a factor ∼3 larger for the c-axis tube orbits than for the in-plane network orbit, in accord with recent microscopic calculations.
- Fermi surface
- Quantum oscillations
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Energy Engineering and Power Technology
- Electrical and Electronic Engineering