Quantum metamagnetic transitions induced by changes in Fermi-surface topology: Applications to a weak itinerant-electron ferromagnet ZrZn 2

Youhei Yamaji*, Takahiro Misawa, Masatoshi Imada

*この研究の対応する著者

研究成果: Article査読

30 被引用数 (Scopus)

抄録

We clarify that metamagnetic transitions in three dimensions show unusual properties as quantum phase transitions if they are accompanied by changes in Fermi-surface topology. An unconventional universality deeply affected by the topological nature of Lifshitz-type transitions emerges around the marginal quantum critical point (MQCP). Here, the MQCP is defined by the meeting point of the finite temperature critical line and a quantum critical line running on the zero temperature plane. The MQCP offers a marked contrast with the Ising universality and the gas-liquid-type criticality satisfied for conventional metamagnetic transitions. At the MQCP, the inverse magnetic susceptibility χ -1 has a diverging slope as a function of the magnetization m (namely, |dχ -1/dm| → ∞) in one side of the transition, which should not occur in any conventional quantum critical phenomena. The exponent of the divergence can be estimated even at finite temperatures. We propose that such an unconventional universality indeed accounts for the metamagnetic transition in ZrZn 2.

本文言語English
論文番号063702
ジャーナルjournal of the physical society of japan
76
6
DOI
出版ステータスPublished - 2007 6月
外部発表はい

ASJC Scopus subject areas

  • 物理学および天文学(全般)

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