New insulating antiferromagnetic quaternary iridates MLa10Ir4O24 (M=Sr, Ba)

Qingbiao Zhao*, Fei Han, Constantinos C. Stoumpos, Tian Heng Han, Hao Li, J. F. Mitchell

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Recently, oxides of Ir4+ have received renewed attention in the condensed matter physics community, as it has been reported that certain iridates have a strongly spin-orbital coupled (SOC) electronic state, Jeff =1/2, that defines the electronic and magnetic properties. The canonical example is the Ruddlesden-Popper compound Sr2IrO4, which has been suggested as a potential route to a new class of high temperature superconductor due to the formal analogy between Jeff=1/2 and the S=1/2 state of the cuprate superconductors. The quest for other iridium oxides that present tests of the underlying SOC physics is underway. In this spirit, here we report the synthesis and physical properties of two new quaternary tetravalent iridates, MLa10Ir4O24 (M=Sr, Ba). The crystal structure of both compounds features isolated IrO6 octahedra in which the electronic configuration of Ir is d5. Both compounds order antiferromagnetically despite the lack of obvious superexchange pathways, and resistivity measurement shows that SrLa10Ir4O24 is an insulator.

Original languageEnglish (US)
Article number11705
JournalScientific reports
Volume5
DOIs
StatePublished - Jul 1 2015

ASJC Scopus subject areas

  • General

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