de Haas-van Alphen effect in two-dimensional and quasi-two-dimensional systems

Article

关键词: QUANTUM INTERFERENCE OSCILLATION;    CHEMICAL-POTENTIAL OSCILLATION;    HIGH MAGNETIC-FIELDS;    ORGANIC CONDUCTORS;    BAND-STRUCTURES;    FERMI LIQUIDS;    BREAKDOWN;    SPIN;    KAPPA-(BEDT-TTF)(2)CU(NCS)(2);    SR2RUO4;   

DOI  :  10.1103/PhysRevB.65.205405

来源: SCIE

【 摘 要 】

We study the de Haas-van Alphen (dHvA) oscillation in two-dimensional and quasi-two-dimensional systems. We give a general formula of the dHvA oscillation in two-dimensional multiband systems. By using this formula, the dHvA oscillation and its temperature dependence for the two-band system are shown. By introducing the interlayer hopping (t(z)), we examine the crossover from two dimensions, where the oscillation of the chemical potential plays an important role in the magnetization oscillation, to three dimensions, where the oscillation of the chemical potential can be neglected as is well know by the Lifshitz and Kosevich formula. The crossover is seen at 4t(z)similar to8tabH/phi(0), where a and b are lattice constants, phi(0) is the flux quantum, and 8t is the width of the total-energy band. We also study the dHvA oscillation in quasi-two-dimensional magnetic-breakdown systems. The quantum interference oscillations such as beta-alpha oscillation as well as the fundamental oscillations are suppressed by t(z), while the beta+alpha oscillation gradually increases as t(z) increases and it has a maximum at t(z)/tapproximate to0.025. This interesting dependence on the dimensionality can be observed in the quasi-two-dimensional organic conductors with uniaxial pressure.

【 授权许可】

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