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.
|ジャーナル||Physica C: Superconductivity and its applications|
|出版ステータス||Published - 2003 5月|
|イベント||proceedings of the 23rd international conference on low temper - Hiroshima, Japan|
継続期間: 2002 8月 20 → 2002 8月 27
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