Ordering and multiple phase transitions in ultrathin nickelate superlattices

Danilo Puggioni*, Alessio Filippetti, Vincenzo Fiorentini

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

30 Scopus citations

Abstract

We interpret via advanced ab initio calculations the multiple phase transitions observed recently in ultrathin LaNiO 3/LaAlO 3 superlattices. The ground state is insulating, weakly charge ordered, and antiferromagnetic due to concurrent structural distortion and weak valency disproportionation. We infer distinct transitions around 50 K and 110 K, respectively, from antiferromagnetic order to moment disorder, and from a structurally dimerized insulator to an undistorted metallic Pauli paramagnet (exhibiting a cupratelike Fermi surface). The results are in satisfactory agreement with experimental results.

Original languageEnglish (US)
Article number195132
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume86
Issue number19
DOIs
StatePublished - Nov 21 2012

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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