Character of doped holes in Nd1−XSrxNiO2

Tharathep Plienbumrung, Michael Thobias Schmid, Maria Daghofer, Andrzej M. Oleś*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

We investigate charge distribution in the recently discovered high-Tc superconductors, layered nickelates. With increasing value of charge-transfer energy, we observe the expected crossover from the cuprate to the local triplet regime upon hole doping. We find that the d − p Coulomb interaction Udp makes Zhang-Rice singlets less favorable, while the amplitude of local triplets at Ni ions is enhanced. By investigating the effective two-band model with orbitals of x2 − y2 and s symmetries we show that antiferromagnetic interactions dominate for electron doping. The screened interactions for the s band suggest the importance of rare-earth atoms in superconducting nickelates.

Original languageEnglish
Article number33
JournalCondensed Matter
Volume6
Issue number3
DOIs
Publication statusPublished - 2021 Sep

Keywords

  • Charge-transfer insulator
  • Cooper pairing
  • Degenerate Hubbard model
  • Entanglement
  • High-T superconductivity
  • Mott insulator
  • Orbital symmetry
  • Two-band model

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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