Journal ArticleDOI
Collective Electron Theory of the Metal‐Semiconductor Transition in Magnetite
James R. Cullen,Earl Callen +1 more
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In this article, the Verwey transition in magnetite is described on a band model, with the electrons selfconsistently breaking the symmetry by ordering in the self-induced Coulomb potential.Abstract:
The Verwey transition in magnetite is described on a band model, with the electrons self‐consistently breaking the symmetry by ordering in the self‐induced Coulomb potential. The order parameter is the difference in occupation numbers on alternate sites. There is a gap in the single‐particle excitation spectrum, and the gap and order parameter undergo a second‐order phase transition. The theory is BCS‐like, with the Verwey temperature being given in the weak‐coupling limit by an exponential in the reciprocal of the density of states at the Fermi level.read more
Citations
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Journal ArticleDOI
Inelastic magnetic X-ray scattering from highly correlated electron systems: La1.2Sr1.8Mn2O7, La0.7Sr0.3MnO3 and Fe3O4
P. A. Montano,Yinwan Li,Yinwan Li,J. F. Mitchell,Bernardo Barbiellini,P.E. Mijnarends,P.E. Mijnarends,S. Kaprzyk,Arun Bansil +8 more
TL;DR: In this article, the magnetoresistance manganites La 1.2 Sr 1.8 Mn 2 O 7 and La 0.7 Sr 0.3 MnO 3 O 4, along various crystallographic directions, over a wide range of temperatures and magnetic fields were measured.
Dissertation
Non-conventional insulators : metal-insulator transition and topological protection
TL;DR: In this paper, a methode for the microfabrication d'anneaux de Aharonov-Bohm avec l'isolant topologique, Bi2Se3, deposee par epitaxie a jet moleculaire.
Journal ArticleDOI
Mössbauer Spectra of (NH4)2SbxSn1−xCl6 Crystals
TL;DR: In this article, a packing model of mixed (NH4)2SbxSn1−xCl6 crystals with x = 0.02, 0.24, and 0.28 was proposed.
Book ChapterDOI
Some Problems about Polarons in Transition Metal Compounds
TL;DR: In this paper, the authors examined the interaction between polarons and the effect of a high concentration on the polaron energy and mass being discussed, and the relationship of the sharp transition to the Neel point in some "amorphous antiferromagnetics" and to the Wigner transition.
References
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Journal ArticleDOI
Magnetic and electric properties of magnetite at low temperatures
TL;DR: The low-temperature transition in magnetite is due to the ordering of the ferrous and ferric ions in the octahedral interstices of the spinel lattice as mentioned in this paper.
Journal ArticleDOI
On the Origin of the Magnetic Anisotropy Energy of Ferrites
Kei Yosida,Masashi Tachiki +1 more
Related Papers (5)
Electronic conductivity and transition point of magnetite (“Fe3O4”)
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