Double exchange model and the unique properties of the manganites

Izyumov, Yu. A.; Skryabin, Yu. N.

doi:10.3367/ufnr.0171.200102a.0121

Cited by 85 publications

(18 citation statements)

References 101 publications

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“…This projector method is also used by Shen and Wang 7 and Izyumov and Skryabin. 8 Recently, Green et al 9 used a many-body coherent potential approximation to study this s-d model and showed that there are unphysical behavior in magnetic susceptibility at halffilling and no magnetic transition for any finite spin S. These indicate that s-d model is not completely equivalent to Anderson and Hasegawa's semiclassical DE model. As a matter of fact, it compares the SCT and the s-d Hamiltonian, one may find that there are some hidden factors in the hopping amplitude of the s-d model that are important to make the s-d Hamiltonian to be completely equivalent to Anderson and Hasegawa's semiclassical model.…”

Section: Introductionmentioning

confidence: 97%

Quantum form of the double-exchange interaction

Kou

2004

Phys. Rev. B

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A quantum form of the Hamiltonian for a double-exchange ͑DE͒ system, based on the results of Anderson and Hasegawa's semiclassical treatment, is presented together with several predictions. The magnetization decreases mainly in 3/2 and 5/2 powers of temperature at low temperature but includes a T 3 term. The Curie temperature, in a rescaled DE coupling energy (ͱ2b/2S 2 )J d unit, is dependent on hole concentration x and has highest value that is about 1/3 that of ordinary Heisenberg magnet at xϭ0.5. The susceptibility at high temperatures lacks a 1/T 2 term and has a characteristic temperature in rescaled DE coupling units that is about 3/4 that of Heisenberg magnet in molecular-field theory.

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Section: Introductionmentioning

confidence: 97%

Quantum form of the double-exchange interaction

Kou

2004

Phys. Rev. B

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“…Solid solutions with perovskite structure have been intensively studied in recent decades due to a wide and unique set of their physical and chemical properties [1][2][3][4][5]. Certain properties, such as the effect of colossal magnetic resistance, charge ordering, magnetic calorimetric effect [6][7][8][9] are not a complete list found in the perovskite structure. The effects are caused by quite labile structure of the parent compound with the general formula ABO 3 .…”

Section: Introductionmentioning

confidence: 99%

Microstructural Changes in La0.5Ca0.5Mn0.5Fe0.5O3 Solid Solutions under the Influence of Catalytic Reaction of Methane Combustion

et al. 2019

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This article attempts to study changes in the microstructure of solid solutions with the perovskite structure La0.5Ca0.5Mn0.5Fe0.5O3 under the action of the methane oxidation reaction medium. By the methods of XRD, XPS and HRTEM the initial condition of the structure and the surface of the perovskite were both investigated. A feature of the structure of this solid solution is the presence of planar defects in the direction of the planes (101). After the methane oxidation reaction, a similar study of perovskite structure was conducted to obtain the changes. It was shown that under the action of the reaction medium, Ca1−xMnxO particles form on the surface of the perovskite phase, while planar defects in La0.5Ca0.5Mn0.5Fe0.5O3 structure remain. In situ XRD experiments on perovskite calcination in helium current up to 750 °C showed the formation of a similar Ca1−xMnxO phase on the perovskite surface.

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“…3 The conductivity of one of the phases, the (Re)CO matrix, can be characterized by a thermally activated mechanism of the semiconductor type r sm (for example, the Mott model 5 ) and the conductivity of the other phase, the SCO sublattice, r DE -by the mechanism of double ferromagnetic exchange of conductivity electrons between cobalt ions of different valences. 4 As a result, the internal contribution of the grain to conductivity can be written as r g ¼ r sm þ r DE and conductance of the grain as a whole is 14…”

Section: Resultsmentioning

confidence: 99%

Low-temperature resistance minimum in granular hole-doped cobaltites

Chiang

Dzyuba

Шевченко

et al. 2012

Low Temperature Physics

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It is for the first time that in three-dimensional granular cobaltites (La1−x Srx)1−yAgyCoO3 with a grain size of about 1 μm and replacement ratios x = 0.35 and y = 0, 0.05 a “metal–nonmetal” conductivity transition was observed, presumably associated with the AFM ordering of granule moments. This transition manifests itself as a minimum in the temperature dependence of resistance of the samples. An explanation of the nature of the minimum is proposed, based on the intragranular mechanism of electron correlation on the basis of the Zener double-exchange and on the intergranular mechanism of spin-polarized electron tunneling between the nearest neighbors under the antiferromagnetic exchange interaction of granule moments. Numerical calculation of the system conductance is made via the model based on summation of intragranular phase conductivities of the electronic system and on the computation of the total impedance of the system as a sum of resistances of individual granules with a given resistive contribution of intergranular tunneling. It is found that the external magnetic field of up to 10 T does not affect the depth of the minimum and its position on the temperature scale, suggesting that the intergranular antiferromagnetic interaction is stable to external magnetic fields.

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Double exchange model and the unique properties of the manganites

Cited by 85 publications

References 101 publications

Quantum form of the double-exchange interaction

Quantum form of the double-exchange interaction

Microstructural Changes in La0.5Ca0.5Mn0.5Fe0.5O3 Solid Solutions under the Influence of Catalytic Reaction of Methane Combustion

Low-temperature resistance minimum in granular hole-doped cobaltites

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