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LDA + $$U_{sc}$$ calculations of phase relations in FeO

Journal Article · · Physical Review Materials
 [1];  [2];  [3]
  1. Columbia Univ., New York, NY (United States); OSTI
  2. University of Pavia (Italy)
  3. 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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