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Title: Nature of the insulating ground state of the 5d postperovskite CaIrO3

Journal Article · · Physical Review Letters
 [1];  [2];  [1];  [1];  [2];  [3];  [1]
  1. Hanyang Univ., Seoul (Korea)
  2. Iowa State Univ., Ames, IA (United States)
  3. 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
Citation Metrics:
Cited by: 21 works
Citation information provided by
Web of Science

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Cited By (3)

Compensation temperatures and exchange bias in La 1.5 Ca 0.5 CoIrO 6 journal May 2016
Block excitonic condensate at n = 3.5 in a spin-orbit coupled t 2 g multiorbital Hubbard model journal April 2019
Models and Materials for Generalized Kitaev Magnetism text January 2017

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