Magnetite: Raman study of the high-pressure and low-temperature effects

L. V. Gasparov; D. Arenas; K. -Y. Choi; G. Guntherodt; H. Berger; L. Forro; G. Margaritondo; V. V. Struzhkin; R. Hemley

doi:10.1063/1.1854476

Magnetite: Raman study of the high-pressure and low-temperature effects

Materials Science 2013-09-19 v1 Strongly Correlated Electrons

Authors: L. V. Gasparov , D. Arenas , K. -Y. Choi , G. Guntherodt , H. Berger , L. Forro , G. Margaritondo , V. V. Struzhkin , R. Hemley

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Abstract

We report the results of a low-temperature (300K-15K) high-pressure (up to 22GPa) Raman study of the Verwey transition in magnetite (Fe3O4). We use additional Raman modes observed below the Verwey transition to determine how the transition temperature changes with the quasihydrostatic pressure. Increase of the pressure results in the linear decrease of the Verwey transition temperature, with no discontinuity. The corresponding pressure coefficient dTV/dP is found to be ~ -5.2 K/GPa. Such a decrease is substantially larger than the one predicted by the mean-field Coulomb interaction model of the transition.

Keywords

magnetite Verwey transition Raman spectroscopy high pressure low temperature pressure coefficient

Cite

@article{arxiv.0907.2456,
  title  = {Magnetite: Raman study of the high-pressure and low-temperature effects},
  author = {L. V. Gasparov and D. Arenas and K. -Y. Choi and G. Guntherodt and H. Berger and L. Forro and G. Margaritondo and V. V. Struzhkin and R. Hemley},
  journal= {arXiv preprint arXiv:0907.2456},
  year   = {2013}
}

Magnetite: Raman study of the high-pressure and low-temperature effects

Abstract

Keywords

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