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We clarify that metamagnetic transitions in three dimensions show unusualproperties as quantum phase transitions if they are accompanied by changes inFermi-surface topology. An unconventional universality deeply affected by thetopological nature of Lifshitz-type transitions emerges around the marginalquantum critical point (MQCP). Here the MQCP is defined by the meeting point ofthe finite temperature critical line and a quantum critical line running on thezero temperature plane. The MQCP offers a marked contrast with the Isinguniversality and the gas-liquid-type criticality satisfied for conventionalmetamagnetic transitions. At the MQCP, the inverse magnetic susceptibilitychi^-1 has diverging slope as a function of the magnetization m (namely, | dchi^-1/d m | -> infty) in one side of the transition, which should not occur inany conventional quantum critical phenomena. The exponent of the divergence canbe estimated even at finite temperatures. We propose that such anunconventional universality indeed accounts for the metamagnetic transition inZrZn_2.Comment: 5pages,4figure

Quantum Metamagnetic Transitions Induced by Changes in Fermi-Surface Topology: Applications to a Weak Itinerant-Electron Ferromagnet ZrZn2

Quantum Metamagnetic Transitions Induced by Changes in Fermi-Surface Topology: Applications to a Weak Itinerant-Electron Ferromagnet ZrZn₂