Universal metastability of the low-spin state in Co2+ systems: Non-Mott type pressure-induced spin-state transition in CoCl2
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SCOPUS
- Title
- Universal metastability of the low-spin state in Co2+ systems: Non-Mott type pressure-induced spin-state transition in CoCl2
- Authors
- Kim, B; Kim, K; Min, BI
- Date Issued
- 2014-03-27
- Publisher
- APS
- Abstract
- We have investigated the pressure-induced spin-state transition in Co2+ systems in terms of a competition between Hund's exchange energy (J) and crystal-field splitting (Delta(CF)). First, we show the universal metastability of the low-spin state in octahedrally coordinated Co2+ systems. Then we present the strategy to search for a Co2+ system, for which the mechanism of spin-state and metal-insulator transitions is governed not by Mott physics but by J versus Delta(CF) physics. Using CoCl2 as a prototypical Co2+ system, we have demonstrated the pressure-induced spin-state transition from high-spin to low-spin, which is accompanied with insulator-to-metal and antiferromagnetic to half-metallic ferromagnetic transitions. Combined with the metastable character of Co2+ and the high compressibility nature of CoCl2, a transition pressure as low as 27 GPa can be identified on the basis of J versus Delta(CF) physics.
- URI
- https://oasis.postech.ac.kr/handle/2014.oak/12322
- DOI
- 10.1103/PHYSREVB.89.115131
- ISSN
- 1098-0121
- Article Type
- Article
- Citation
- PHYSICAL REVIEW B, vol. 89, no. 11, page. 115131 - 115131, 2014-03-27
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