Interfacial charge-transfer Mott state in iridate–nickelate superlattices

Xiaoran Liu, Michele Kotiuga, Heung Sik Kim, Alpha T. N’Diaye, Yongseong Choi, Qinghua Zhang, Yanwei Cao, Mikhail Kareev, Fangdi Wen, Banabir Pal, John W. Freeland, Lin Gu, Daniel Haskel, Padraic Shafer, Elke Arenholz, Kristjan Haule, David Vanderbilt, Karin M. Rabe, Jak Chakhalian

Research output: Contribution to journalArticlepeer-review

31 Scopus citations

Abstract

We investigate SrIrO3/LaNiO3 superlattices in which we observe a full electron transfer at the interface from Ir to Ni, triggering a massive structural and electronic reconstruction. Through experimental characterization and first-principles calculations, we determine that a large crystal field splitting from the distorted interfacial IrO6 octahedra surprisingly dominates over the spin–orbit coupling and together with the Hund’s coupling results in the high-spin (S = 1) configurations on both the Ir and Ni sites. This demonstrates the power of interfacial charge transfer in coupling lattice, charge, orbital, and spin degrees of freedom, opening fresh avenues of investigation of quantum states in oxide superlattices.

Original languageEnglish (US)
Pages (from-to)19863-19868
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume116
Issue number40
DOIs
StatePublished - Oct 1 2019

All Science Journal Classification (ASJC) codes

  • General

Keywords

  • Interfacial charge transfer
  • Iridates
  • Nickelates
  • Superlattice

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