Drastic change of the Fermi surface across the metamagnetic transition in CeRh2Si2

Article

关键词: DENSITY BAND THEORY;    SUPERCONDUCTING PROPERTIES;    FERROMAGNETIC CERU2GE2;    QUANTUM CRITICALITY;    CRITICAL PRESSURE;    CERU2SI2;    METALS;    STATE;    DHVA;   

DOI  :  10.1103/PhysRevB.95.161107

来源: SCIE

【 摘 要 】

We report high field de Haas-van Alphen (dHvA) effect measurements in CeRh2Si2 both below and above the first-order 26 T metamagnetic transition from an antiferromagnetic to a polarized paramagnetic state. The dHvA frequencies observed above the transition are much higher than those observed below, implying a drastic change of the Fermi-surface size. The dHvA frequencies above the transition and their angular dependence are in good agreement with band-structure calculations for LaRh2Si2, which correspond to CeRh2Si2 with localized f electrons. Given that the f electrons are also localized at low fields in CeRh2Si2, the Fermi-surface reconstruction is due to the suppression of antiferromagnetism and the restoration of the crystallographic Brillouin zone rather than the delocalization of the f electrons. This example suggests that the intuitive notation of small and large Fermi surfaces commonly used for localized and itinerant f electrons, respectively, requires careful consideration, taking into account the modification of the Brillouin zone in the antiferromagnetic state, when interpreting experimental results.

【 授权许可】

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