Spin-zero anomaly in the magnetic quantum oscillations of a two-dimensional metal

Details Spin-zero anomaly in the magnetic quantum oscillations of a two-dimensional metal Spin-zero anomaly in the magnetic quantum oscillations of a two-dimensional metal

2004-12-08

arxiv.org/abs/cond-mat/0412202v1

New J. Phys. 10 (2008) 083032

Physics

Condensed Matter

Strongly Correlated Electrons

Scientific paper

10.1088/1367-2630/10/8/083032

We report on an anomalous behavior of the spin-splitting zeros in the de Haas-van Alphen (dHvA) signal of a quasi-two-dimensional organic superconductor. The zeros as well as the angular dependence of the amplitude of the second harmonic deviate remarkably from the standard Lifshitz-Kosevich (LK) prediction. In contrast, the angular dependence of the fundamental dHvA amplitude as well as the spin-splitting zeros of the Shubnikov-de Haas signal follow the LK theory. We can explain this behavior by small chemical-potential oscillations and find a very good agreement between theory and experiment. A detailed wave-shape analysis of the dHvA signal corroborates the existence of an oscillating chemical potential.

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