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de Haas-van Alphen effect in two- and quasi-two-dimensional metals and superconductors
Ist Teil von
Philosophical magazine. B, Physics of condensed matter. Structural, electronic, optical, and magnetic properties., 2001-01, Vol.81 (1), p.55-74
Ort / Verlag
Taylor & Francis Group
Erscheinungsjahr
2001
Link zum Volltext
Beschreibungen/Notizen
An analytical form of the quantum magnetization oscillations (de Haas van Alphen effect) is derived for two- and quasi-two-dimensional metals in normal and superconducting mixed states. The theory is developed under condition μ/ω
c
≫ 1 (μ is the chemical potential and ω
c
the cyclotron frequency), which is proved to be valid for using grand canonical ensemble in the systems of low dimensionality. The effects of the impurities, temperature, spin splitting and vortex lattice (in the case of superconductors of type II) are taken into account. Contrary to the three-dimensional case, the oscillations in sufficiently pure systems of low dimensionality and at sufficiently low temperatures are characterized by a sawtooth waveform, which became smoother with increasing temperature and increasing concentration of impurities. In the normal quasi-two-dimensional systems, the expression for the magnetization oscillations includes an extra factor expressed through the transfer integral between the layers. The additional damping effect due to the vortex lattice is found. The criterion of proximity to the upper critical field for the observation of the de Haas-van Alphen effect in the superconducting mixed state is established.