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1
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Electron Correlation Phenomena in Selected Transition Metal Oxides

100%
Honig J.
Acta Physica Polonica A
|
1994
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vol. 85
|
issue 1
53-77
EN
The theory of electron correlation phenomena is reviewed and used to interpret the transport, thermal, or magnetic properties of V_{2}O_{3}, LaNiO_{3} and Fe_{3}O_{4} systems, each of which to a greater or lesser degree displays correlation effects. A rationale is provided for interpreting the various types of phase transitions encountered in the vanadium sesquioxide and magnetite host systems and to show why these are altered by small compositional variations.
2
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Manifestation of Electron Correlations in the V_2O_3 and NiS_2 Systems

100%
Honig J.
Acta Physica Polonica A
|
2007
|
vol. 111
|
issue 4
437-454
EN
The experimental manifestation of electron correlation effects in the V_2O_3 and NiS_2 systems are reviewed, and recent elementary theories for interpreting the many different types of metal-insulator transitions based on these theories are provided. Research on the critical phenomena displayed by the interacting electrons in these systems is also reviewed.
3
Content available remote

Correlation-Driven Metal-Insulator Transitions

100%
Honig J.
Acta Physica Polonica A
|
2000
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vol. 97
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issue 1
141-156
EN
The effect of correlation-driven electronic transitions are described for the V_{2}O_{3}, NiS_{2-x}Se_{x}, and Fe_{3}O_{4} systems. The various tranformations can all be rationalized in terms of elementary concepts pertaining to the Mott-Hubbard intraatomic electronic interactions or in terms of an order-disorder formalism involving Coulomb interactions among electrons on adjacent sites. Attention is directed to some outstanding issues that require further resolution.
4
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Analysis of Irreversible Processes across Narrow Junctions

64%
Honig J., Hoehn R.
Acta Physica Polonica A
|
2011
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vol. 119
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issue 3
323-327
EN
The rectification of the second law of thermodynamics is used to directly relate irreversible heat and work transfers to reversible processes. This permits the construction of thermodynamic functions of state that include entropy contributions due to irreversible processes. A general expression is set up to determine the entropy changes in terms of experimentally accessible parameters when a system is interacting with its surroundings via quasistatic irreversible operations. The procedure is used to determine the entropy changes across a narrow junction in terms of pressure and temperature differences between the system and its surroundings, including cyclic processes.
5
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Thermodynamic Analysis of Metal-Insulator Transitions. Effect of Changes in the Density of States Function

64%
Hoehn R., Honig J.
Acta Physica Polonica A
|
2009
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vol. 115
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issue 3
745-754
EN
Prior theories of metal-insulator transitions by Spałek et al. were extended to include quartic terms in the temperature and by introducing two different density of state functions. The effects of these extensions on low-temperature metal-insulator transitions and on reentrant metallic behavior in solids have been investigated.
6
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Cation Distribution in Fe_{3(1-δ)}O_{4} and Low Level Doped Fe_{3-x}M_{x}O_{4}, M=Ti, Zn, Al

45%
Kąkol Z., Kozłowski A., Sabol J., Metcalf P., Honig J.
Acta Physica Polonica A
|
1994
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vol. 85
|
issue 1
223-227
EN
Systematic magnetic saturation moment and electrical resistivity measurements of the Fe_{3(1-δ)}O_{4} and Fe_{3-x}M_{x}O_{4} (M = Ti, Zn, Al) are presented. Cation distributions for low level doping are proposed and compositional dependencies of the Verwey transition temperature are determined. The latter show striking similarities in their dependence on cation vacancies and dopant concentration for any extraneous cations. These data are the basis for the analysis of the correlation between the presented cations distributions and the Verwey transition.
7
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Heat Capacity and Elastic Constants of Fe_{3-x}Zn_{x}O_{4} in the Vicinity of the Verwey Transition

39%
Kozłowski A., Kąkol Z., Schwenk H., Bareiter S., Hinkel C., Luthi B., Honig J.
Acta Physica Polonica A
|
2000
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vol. 97
|
issue 5
883-887
EN
The results of the heat capacity and elastic constant studies of Fe_{3-x}Zn_{x}O_{4} (x<0.04) series are reported. Adiabatic heat capacity measurements, performed on single crystals, show the clear change of the transition character from first order for low Zn content (x<0.012) to the higher order in 0.012
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