Infrared and Raman studies of the Verwey transition in magnetite

Details Infrared and Raman studies of the Verwey transition in magnetite Infrared and Raman studies of the Verwey transition in magnetite

1999-05-19

arxiv.org/abs/cond-mat/9905278v1

Physics

Condensed Matter

16 pages, 5 Postscript figures, uses revtex.sty. submitted to Physical Review B

Scientific paper

10.1103/PhysRevB.62.7939

We present infrared and Raman measurements of magnetite (Fe_3O_4). This material is known to undergo a metal-insulator and a structural transition (Verwey transition) at T_V=120K. At temperatures below T_V, we observe a strong gap-like suppression of the optical conductivity below 1000 cm^-1. The structural aspect of the Verwey transition demonstrates itself by the appearance of additional infrared- and Raman-active phonons. The frequencies of the infrared-active phonons show no significant singularities at the transition whereas their linewidths increase. The frequency and linewidth of the Raman-active phonon at 670 cm^-1 changes abruptly at the transition. For T

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