New insulating antiferromagnetic quaternary iridates MLa10Ir4O24 (M=Sr, Ba)
- Argonne National Lab. (ANL), Argonne, IL (United States); Chinese Academy of Sciences, Shanghai (China)
- Argonne National Lab. (ANL), Argonne, IL (United States)
- Argonne National Lab. (ANL), Argonne, IL (United States); Univ. of Chicago, Chicago, IL (United States)
Recently, oxides of Ir4+ have received renewed attention in the condensed matter physics community, as it was reported that certain such iridates have a strongly spin-orbital coupled (SOC) electronic state, Jeff=½. As a consequence, the critical ratio of bandwidth to Coulomb repulsion, W/U, in these extended solids lies close to unity, with an ensuing Mott insulating ground state. The canonical example for such physics 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 = ½ and the S = ½ state of the cuprate superconductors. The quest for other iridium oxides that present tests of the underlying SOC physics is underway. 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 are antiferromagnetic, and resistivity measurement shows that SrLa10Ir4O24 is an insulator. By isolating the octahedra and thus eliminating bandwidth and super-exchange as a competing influence on the electronic structure, compounds such as these can provide a platform for testing the detailed nature and range of applicability of the Jeff = ½ description.
- Research Organization:
- Argonne National Laboratory (ANL), Argonne, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), Basic Energy Sciences (BES)
- Grant/Contract Number:
- AC02-06CH11357
- OSTI ID:
- 1224999
- Alternate ID(s):
- OSTI ID: 1357034
- Journal Information:
- Scientific Reports, Vol. 5; ISSN 2045-2322
- Publisher:
- Nature Publishing GroupCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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