Fermi Surface Expansion above Critical Temperature in a Hund Ferromagnet

Yusuke Nomura, Shiro Sakai, Ryotaro Arita

研究成果: Article査読

抄録

Using a cluster extension of the dynamical mean-field theory, we show that strongly correlated metals subject to Hund's physics exhibit significant electronic structure modulations above magnetic transition temperatures. In particular, in a ferromagnet having a large local moment due to Hund's coupling (Hund's ferromagnet), the Fermi surface expands even above the Curie temperature (TC) as if a spin polarization occurred. Behind this phenomenon, effective "Hund's physics"works in momentum space, originating from ferromagnetic fluctuations in the strong-coupling regime. The resulting significantly momentum-dependent (spatially nonlocal) electron correlations induce an electronic structure reconstruction involving a Fermi surface volume change and a redistribution of the momentum-space occupation. Our finding will give a deeper insight into the physics of Hund's ferromagnets above TC.

本文言語English
論文番号206401
ジャーナルPhysical review letters
128
20
DOI
出版ステータスPublished - 2022 5月 20
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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