1999/05/19 by L. V. Gasparov, D. B. Tanner, D. B. Romero +5 · 1 citation
Energy · Materials Science · Physics and Astronomy · #Charge (physics) #Charge ordering #Clay minerals and soil interactions #Infrared #Iron oxide chemistry and applications #Magnetic Properties and Synthesis of Ferrites #Magnetite #Materials science #Metallurgy #Nuclear magnetic resonance #Optics #Physics #Quantum mechanics #Raman spectroscopy #cond-mat
paper · pdf · doi:10.1103/physrevb.62.7939
16 pages, 5 Postscript figures, uses revtex.sty. submitted to Physical Review B
arxiv created 1999/05/19 · openalex publication_date 2000/09/15 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
We present infrared and Raman measurements of magnetite (Fe3O4). This material is known to undergo a metal-insulator and a structural transition (Verwey transition) at TV=120 K. The structural aspect of the Verwey transition is disclosed by the appearance of additional infrared-active 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^\ensuremath-1 change abruptly at the transition. For T<TV, we observe fine structure in the infrared and Raman spectra which may indicate strong anharmonicity of the system below the transition. The effective mass of the mobile carriers is estimated to be m*\ensuremath≈100m, where m is the electronic mass.