Nature of the insulating ground state of the 5d postperovskite CaIrO3
- Hanyang Univ., Seoul (Korea)
- Iowa State Univ., Ames, IA (United States)
- Iowa State Univ., Ames, IA (United States); Univ. of Science and Technology of China, Anhui (China)
In this study, the insulating ground state of the 5d transition metal oxide CaIrO3 has been classified as a Mott-type insulator. Based on a systematic density functional theory (DFT) study with local, semilocal, and hybrid exchange-correlation functionals, we reveal that the Ir t2g states exhibit large splittings and one-dimensional electronic states along the c axis due to a tetragonal crystal field. Our hybrid DFT calculation adequately describes the antiferromagnetic (AFM) order along the c direction via a superexchange interaction between Ir4+ spins. Furthermore, the spin-orbit coupling (SOC) hybridizes the t2g states to open an insulating gap. These results indicate that CaIrO3 can be represented as a spin-orbit Slater insulator, driven by the interplay between a long-range AFM order and the SOC. Such a Slater mechanism for the gap formation is also demonstrated by the DFT + dynamical mean field theory calculation, where the metal-insulator transition and the paramagnetic to AFM phase transition are concomitant with each other.
- Research Organization:
- Ames Lab., Ames, IA (United States)
- Sponsoring Organization:
- USDOE
- Grant/Contract Number:
- 2015R1A2A2A01003248; KSC-2014-C3-011; AC02-07CH11358; 61434002
- OSTI ID:
- 1234528
- Alternate ID(s):
- OSTI ID: 1213107
- Report Number(s):
- IS-J-8795; PRLTAO; TRN: US1600382
- Journal Information:
- Physical Review Letters, Vol. 115, Issue 9; ISSN 0031-9007
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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