Bibliographic Details
| Title: |
Breakdown of the Verwey–Mott Localization Hypothesis in Magnetite. |
| Authors: |
Pasternak, M. P.1 |
| Source: |
Hyperfine Interactions. 2003, Vol. 151/152 Issue 1-4, p253-261. 9p. |
| Subjects: |
Transition temperature, Spectrum analysis, Magnetite, Constitution of matter, Phase transitions, Physics |
| Abstract: |
Temperature-dependent 57Fe Mössbauer spectroscopy to 40 GPa shows that Fe3O4 magnetite undergoes a coordination crossover (CC), whereby charge density is shifted from octahedral to tetrahedral sites and the spinel structure thus changes from inverse to normal with increasing pressure and decreasing temperature. A precursor to the CC is a d-charge decoupling within the octahedral sites at the inverse-spinel phase. The CC transition takes place almost exactly at the Verwey transition temperature (TV=122 K) at ambient pressure. While TV decreases with pressure the CC-transition temperature increases with pressure, reaching 300 K at 10 GPa. The d electron localization mechanism proposed by Verwey and later by Mott for TTV. [ABSTRACT FROM AUTHOR] |
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| Database: |
Engineering Source |
