論文

査読有り
2020年1月

Nickelate superconductors: Multiorbital nature and spin freezing

PHYSICAL REVIEW B
  • Philipp Werner
  • ,
  • Shintaro Hoshino

101
4
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1103/PhysRevB.101.041104
出版者・発行元
AMER PHYSICAL SOC

Superconductivity with a remarkably high T-c has recently been found in Sr-doped NdNiO2 thin films. While this system bears strong similarities to the cuprates, some differences, such as a weaker antiferromagnetic exchange coupling and possible high-spin moments on the doped Ni sites have been pointed out. Here, we investigate the effect of Hund coupling and crystal field splitting in a simple model system and argue that a multiorbital description of nickelate superconductors is warranted, especially in the strongly hole-doped regime. We then look at this system from the viewpoint of the spin-freezing theory of unconventional superconductivity, which provides a unified understanding of unconventional superconductivity in a broad range of compounds. Nd0.8Sr0.2NiO2 falls into a parameter regime influenced by two spin-freezing crossovers; one related to the emergent multiorbital nature in the strongly doped regime and the other related to the single-band character and square lattice geometry in the weakly doped regime.

Web of Science ® 被引用回数 : 28

リンク情報
DOI
https://doi.org/10.1103/PhysRevB.101.041104
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000505984100001&DestApp=WOS_CPL

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