Journal
JOURNAL OF APPLIED PHYSICS
Volume 112, Issue 4, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4747834
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Funding
- National Science Foundation (NSF) [DMR-0805073, DMR-0958349]
- Office of Naval Research [N00014-06-1-0133]
- UNF
- NSF [DMR-07-06593]
- Swiss NCCR research pool MaNEP of the Swiss NSF
- DOE/BES [DE-FG02-02ER45955]
- Russian Foundation for Basic Research [09-02-01527-a, 11-02-00291-a, 11-02-00636-a]
- Russian Ministry of Science [16.518.11.7021]
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We employed Raman spectroscopy to investigate how the hydrostatic pressure affects the temperature of the Verwey transition in pure (Fe3O4) and Al-doped (Fe2.8Al0.2O4) magnetite. In both samples, pressure suppresses the transition. The Al-doped sample displays no transition above 8 GPa. We do not observe such discontinuity in a pure magnetite, which suggests that the discontinuity is doping driven. Our Clausius-Clapeyron formula based analysis of the pressure-transition temperature dependence is in excellent agreement with our data in pure magnetite. The Al doping leads to a smaller entropy change and larger volume expansion consistent with partial charge ordering at the transition. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4747834]
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