LDA + $$U_{sc}$$ calculations of phase relations in FeO
Journal Article
·
· Physical Review Materials
- Columbia Univ., New York, NY (United States); OSTI
- University of Pavia (Italy)
- Columbia Univ., New York, NY (United States)
Using the LDA + $$U_{sc}$$ method, we present calculation phase relations of iron monoxides involving five polytypes in multiple spin-state configurations. In this work, the Hubbard parameter $$\textit{U}$$ is determined self-consistently simultaneously with the occupation matrix and structures at arbitrary pressures. The Hubbard parameter strongly depends on pressure, structure, and spin state. Comparison with experimental structural data indicates the LDA + $$U_{sc}$$ can predict structure, compression curves, phase relations, and transition pressures very well for the insulating $$\textit{B}$$1 and $$\textit{iB}$$8 states. However, it requires additional calculations using the Mermin functional that includes the electronic entropic contribution to the free energy to obtain an $$\textit{nB}$$8 metallic state and a consistent $$\textit{iB}$$8 to $$\textit{nB}$$8 insulator to metal transition pressure.
- Research Organization:
- Columbia Univ., New York, NY (United States)
- Sponsoring Organization:
- National Science Foundation (NSF); USDOE Office of Science (SC)
- Grant/Contract Number:
- SC0019759
- OSTI ID:
- 1803887
- Journal Information:
- Physical Review Materials, Journal Name: Physical Review Materials Journal Issue: 6 Vol. 4; ISSN 2475-9953
- Publisher:
- American Physical Society (APS)Copyright Statement
- Country of Publication:
- United States
- Language:
- English
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