Verwey transition in magnetite at high pressure: A new quantum critical point at the onset of metallization

We provide a detailed physical discussion of the existence of a quantum critical point (QCP) at the metallization threshold of an almost stoichiometric magnetite, with the critical pressure pc=8GPa. A presence of an additional crossover or a critical line separating metallic and semiconducting state...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 2009-10, Vol.404 (19), p.2894-2897
Main Authors: Spałek, J., Kozłowski, A., Ka¸kol, Z., Tarnawski, Z., Fukami, Y., Ono, F., Zach, R., Spalek, L.J., Honig, J.M.
Format: Article
Language:English
Subjects:
Condensed matter: electronic structure, electrical, magnetic, and optical properties
Electron states
Exact sciences and technology
Magnetite metallization
Metal-insulator transitions and other electronic transitions
Physics
Quantum critical point
Semiconductor-metal transition
Verwey transition
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Summary:We provide a detailed physical discussion of the existence of a quantum critical point (QCP) at the metallization threshold of an almost stoichiometric magnetite, with the critical pressure pc=8GPa. A presence of an additional crossover or a critical line separating metallic and semiconducting states is proposed. A connection of the critical behavior to that of a spinless-fermion model with coupling of fermions to the lattice distortion is outlined.
ISSN:0921-4526
1873-2135
DOI:10.1016/j.physb.2009.07.079