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Characterization of the metal–insulator phase transition of Fe3(1−δ)O4 surfaces

✍ Scribed by N.-T.H. Kim-Ngan; W. Soszka; Z. Tarnawski; A. Kozłowski

Publisher
Elsevier Science
Year
2004
Tongue
English
Weight
215 KB
Volume
353
Category
Article
ISSN
0921-4526

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✦ Synopsis

A sharp specific-heat peak at 123.5 K with an enormous increase of the peak-intensity in a narrow temperature step DT of 0.2 K was observed for the perfect stoichiometric magnetite sample, while a broad maximum around 98 K with DT of 20 K was found for the non-stoichiometric one. The surface Verwey transition was characterized by means of low-energy ion scattering technique using 4-8 keV He + , Ne + and Ar + beam. The Verwey transition of these surfaces was indicated by a sharp step-rise (under Ne + and Ar + ion beams) and/or a minimum (under He + ion beam) in the temperature dependence of the scattering ion yield at 138 K and around 125 K, respectively.

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On the mean-field theory of the metal-in
On the mean-field theory of the metal-insulator phase transition
✍ J.G. Brankov; N.Ch. Pesheva 📂 Article 📅 1985 🏛 Elsevier Science 🌐 English ⚖ 765 KB

Two mean-field models describing the metal-insulator phase transition are studied. In the model due to Keldysh and Kopaev (1964) different effective masses in the valence and conduction bands are considered and in the model due to Mattis and Langer (1970) the exact S.C. and b.c.c. densities of state