Charge segregation and a nonuniform magnetic state in donor-and acceptor-doped LaMnO3

Loshkareva, N. N.; Королев, А. В.; Arbuzova, T. I.; Solin, N. I.; Viglin, N. A.; Smolyak, I. B.; Bebenin, N. G.; Sukhorukov, Yu. P.; Наумов, С. В.; Kostromitina, N. V.; Balbashov, A. M.

doi:10.1134/1.1514781

Cited by 16 publications

(7 citation statements)

References 20 publications

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“…Moreover, the magnitude of magnetotransmission depends on the film thickness, the mechanical stresses, and the interface phenomena [27,[41][42][43][44]. Notice that because of quasi-local character of the magnetotransmission (different optical responses from conducting and non-conducting areas) the Δt/t measurements are a good tool for studying the magnetic and charge inhomogeneity in CMR materials [45,46].…”

Section: Ferromagnetic Manganites With Colossal Magnetoresistancementioning

confidence: 99%

“…Charge and magnetic inhomogeneities lead to the decrease of the magnitude of the effects and give rise to additional features in the temperature and magnetic field dependences (e.g. hysteresis) [43][44][45][46][47]. Besides magnetic field, an electric field can also influence the magnetic order and therefore change the magnetotransmission [48].…”

Section: Ferromagnetic Manganites With Colossal Magnetoresistancementioning

confidence: 99%

See 1 more Smart Citation

Giant magnetotransmission and magnetoreflection in ferromagnetic materials

Telegin

Sukhorukov

Loshkareva

et al. 2015

Journal of Magnetism and Magnetic Materials

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Section: Ferromagnetic Manganites With Colossal Magnetoresistancementioning

confidence: 99%

Section: Ferromagnetic Manganites With Colossal Magnetoresistancementioning

confidence: 99%

Giant magnetotransmission and magnetoreflection in ferromagnetic materials

Telegin

Sukhorukov

Loshkareva

et al. 2015

Journal of Magnetism and Magnetic Materials

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“…Studies of the paramagnetic susceptibility χ 0 for Sr7 [23] and Ca10 [24] at high (up to 600 K) tempera tures show the conservation of short range magnetic order up to T ӷ T C . The Curie-Weiss law for Ca10 holds only at T > 450 K ≈ T OO' above the transition temperature from the orthorhombic Pnmb phase to the pseudo cubic one.…”

Section: Resultsmentioning

confidence: 99%

Intrinsic inhomogeneities of low-doped lanthanum manganites in the paramagnetic temperature range

Solin

2012

J. Exp. Theor. Phys.

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The nature of the electrical resistivity for low doped lanthanum manganites is elucidated. The electrical resistivity is described by the Efros-Shklovskii law (lnρ ∝ (T 0 /T) -1/2 , where T 0 ∝ 1/R ls ) in the tem perature range from T* ≈ 300 K ≈ T C (T C is the Curie temperature for conducting manganites) to their T C and is explained by the tunneling of carriers between localized states. The magnetoresistance is explained by a change in the size of localized states R ls in a magnetic field. The patterns of change in R ls with temperature and magnetic field strength determined from magnetotransport properties are satisfactorily described in the model of phase separation into small radius metallic droplets in a paramagnetic matrix. The sizes R ls and their temperature dependence have been estimated through magnetic measurements. The results confirm the existence of a Griffith phase. The intrinsic inhomogeneities produced by thermodynamic phase separation determine the electrical resistivity and magnetoresistance of lanthanum manganites.

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“…Manganate-lanthanum perovskites, LaMnO 3 , of stoichiometric composition possess an orthorhombic structure [18][19][20]. A shift in oxygen octohedra is responsible for its rhombohedric distortion [21].…”

Section: Resultsmentioning

confidence: 99%

“…In this case doping with Sr 2+ ions leads to an increase in both the content of Mn 4+ ions [19,22] and to an increase in the density of defects in the crystalline lattice, first an increase in anion vacancies (at elevated temperatures) and then an increase in cation vacancies (upon cooling of the samples). By violating the exchange interactions between the Mn 3+ and Mn 4+ ions [20], such defects necessarily lead to a change in the temperature of the phase transitions and in transport and magnetic properties.…”

Section: Resultsmentioning

confidence: 99%

Influence of composition and sintering temperature on density of structure defects, phase transitions, and properties of magneto-resistive strontium-doped ceramic of manganate-lanthanum perovskites

Турченко

Pashchenko

Prokopenko

et al. 2006

Powder Metall Met Ceram

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Ceramic samples of La 31−x Sr 2+ x MnO 2− 3 (x = 0, 0.1, 0.15, 0.2, 0.3, 0.4), sintered at different temperatures (1150, 1200, 1350, and 1500°C) are investigated by means of methods of x-ray diffraction analysis and resistive and magnetic analysis. It is established that the perovskite structure parameter (a) and degree of its rhombohedric (R 3 c) distortion (α) both decrease with increasing content of Sr 2+ in 4). The metal − semiconductor (T ms ) and ferromagnetic − paramagnetic (T c ) phase transition temperatures and magnetoresistive peak temperature (T p ) all increase, while the activation energy (E a ) decreases. The density of defects in the lattice which contains anion (V (a) ) and cation (in A and B positions) vacancies, average valency of manganese (ω), and tolerance factor (t) also increase. It is shown that with Sr 2+ doping, charge compensation is achieved by two mechanisms, first,the Mn 3+ → Mn 4+ transition (∼80%), and second, the formation of V (a) vacancies (∼20%), with the contribution of the second mechanism increasing with increasing sintering temperature. With increasing x the magnetoresistive effect decreases at T p and the lowfield tunneling magnetoresistive effect increases slightly. It is established that the concentration dependence of the intracrystaline peak magnetoresistive effect at T p is opposite to the concentration dependence of the intercrystalline magnetoresistive effect in the semiconductor region for T << T p .

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Charge segregation and a nonuniform magnetic state in donor-and acceptor-doped LaMnO3

Cited by 16 publications

References 20 publications

Giant magnetotransmission and magnetoreflection in ferromagnetic materials

Giant magnetotransmission and magnetoreflection in ferromagnetic materials

Intrinsic inhomogeneities of low-doped lanthanum manganites in the paramagnetic temperature range

Influence of composition and sintering temperature on density of structure defects, phase transitions, and properties of magneto-resistive strontium-doped ceramic of manganate-lanthanum perovskites

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