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
Impurity Effects on the Transition Temperature of Magnetite
TL;DR: In this article, the influence of oxidization and various impurities on the transition temperature of the Verwey order in magnetite was studied experimentally and a small amount of impurities such as Li, Ni, Co, Cr, Al, Ti, Mg, Zn and Ga was determined by magnetic measurement.
Journal ArticleDOI
Investigation of the insulating phase of magnetite by NMR and the Mössbauer effect
Mark Rubinstein,D.W. Forester +1 more
TL;DR: In this paper, low temperature NMR and Mossbauer effect data are presented and interpreted as further evidence against the validity of the Verwey model of magnetite, and they are interpreted as evidence for the existence of magnetites.
Journal ArticleDOI
Cooperative Magnetic Transitions in the Titanium‐Oxygen System: A New Approach
L. N. Mulay,W. J. Danley +1 more
TL;DR: In this paper, the free electron gas model was used to explain the magnetic susceptibility measurements on pure single phases of Ti3O5, Ti4O7, Ti5O9, and Ti6O11.
Journal ArticleDOI
Metal–insulator transition induced by 16O–18O oxygen isotope exchange in colossal negative magnetoresistance manganites
N. A. Babushkina,Lyubov Belova,V. I. Ozhogin,O. Yu. Gorbenko,A. R. Kaul,A. A. Bosak,Daniel I. Khomskii,K. I. Kugel +7 more
TL;DR: In this paper, the effect of 16O→18O isotope exchange on the electric resistivity was studied for (La 1−yPry)0.7Ca0.3MnO3 ceramic samples.
Book ChapterDOI
Chapter 4 Oxide spinels
S. Krupička,P. Novák +1 more
TL;DR: In this article, the crystal structure, chemistry, and magnetic properties of oxide spinels are discussed, and the spinel structure is one of the most frequently encountered with the MM′ 2 X 4 compounds.
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
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Electronic conductivity and transition point of magnetite (“Fe3O4”)
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