Magnetoresistance of substituted lanthanum manganites La0.7Ca0.3MnO3 upon nonequilibrium overheating of carriers

Shaykhutdinov, K. A.; Semenov, S.; Popkov, S. I.; Balaev, D. A.; Быков, А. А.; Dubrovskiy, A. A.; Петров, М. И.; Волков, Н. В.

doi:10.1063/1.3573666

Cited by 4 publications

(5 citation statements)

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“…In this range of magnetic field, the dissipation occurs according to the Arrhenius law R % exp (ÀU(H)/T), 11 which is characteristic for the magnetic flux creep model with temperature-independent energy pinning U(H). [12][13][14][15][16] As can be seen from Fig. 4, the introduction of 10 wt.…”

Section: Methodsmentioning

confidence: 79%

“…The features of the pinning in YBa 2 Cu 3 O 7Àx nanocomposite films, obtained by the dissolution method and containing randomly oriented non-superconducting "nanodots" BaZrO 3 , Y 2 O 3 , BaCeO 3 , and Ba 2 YTaO 6 with an average radius of (10)(11)(12)(13)(14)(15)(16)(17)(18)(19)(20) nm, are studied in the work. 2 The record pinning force of more than 20 GN/m 3 has been achieved in films with BaZrO 3 content about 10 mol.…”

Section: Introductionmentioning

confidence: 99%

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Enhancing of magnetic flux pinning in YBa2Cu3O7−x/CuO granular composites

Ушаков

Карпов

Лепешев

et al. 2015

Journal of Applied Physics

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Enhancement of flux pinning and critical currents in YBa 2 Cu 3 O 7 − δ films by nanoscale iridium pretreatment of substrate surfacesThis paper shows that the combination of self-assembled structures in the form of "whiskers" and nanoparticles, which appear as a result of the joint sintering powders YBa 2 Cu 3 O 7Àx and arc nanopowders CuO, leads to a significant increase in the current density and the appearance of the peak effect in strong magnetic fields range. Very high critical current density appears from a complex vortex pinning, where the defects in the form of "whiskers" provides more energy of pinning, and nanoparticles inhibit the flux creep. Regulation of the morphology of such structures can be achieved by simple change of the concentration of nanodispersed additives. It is shown that the optimal additive is CuO equal to 20 wt. %. V C 2015 AIP Publishing LLC.

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Section: Methodsmentioning

confidence: 79%

Section: Introductionmentioning

confidence: 99%

Enhancing of magnetic flux pinning in YBa2Cu3O7−x/CuO granular composites

Ушаков

Карпов

Лепешев

et al. 2015

Journal of Applied Physics

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“…При этом решающий вклад в формирование температурной зависимости электропроводности вносит полупроводниковая фаза s-электронов. Оценки зависимости активационной проводимости от температуры и внешнего магнитного поля, выполненные с учетом формул (9,10), согласуются с наблюдаемым в рассматриваемых составах эффектом КМС. При этом проведенный численный анализ показывает, что сильное влияние магнитного поля вытекает из формул (9) для пространственных флуктуаций электронной плотности.…”

Section: численный анализ фазового переходаunclassified

“…При фазовых переходах первого рода в ферромагнитных полупроводниках наблюдается ближний порядок с локальной намагниченностью [8]. Особенностью фазовых переходов в ферромагнитных полупроводниках является возникновение в электрическом поле сильно нелинейных вольт-амперных характеристик, заметное влияние на которые оказывает магнитное поле [9,10].…”

Section: Introductionunclassified

Фазовый переход первого рода в ферромагнитных полупроводниках во внешних электрическом и магнитном полях (на примере La-=SUB=-1-x-=/SUB=-Ca-=SUB=-x-=/SUB=-MnO-=SUB=-3-=/SUB=-)

Повзнер¹,

Волков²,

Лопатко³

et al. 2023

Физика Твердого Тела

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It is shown that during a first-order phase transition in ferromagnetic semiconductors based on lanthanum manganites, along with the semiconductor phase of s-electrons, a phase arises with fluctuation short-range order associated with a change in the sign of the intermode interaction parameter in the system of d-electrons. The phase separation region is characterized by fluctuations of local magnetization depending on temperature and external magnetic field. In this case, the temperature of the first order phase transition, above which phase separation arises, is appreciably affected by double exchange. Due to self-heating, the phase separation is significantly affected by the electric field, which leads to N-shaped current-voltage characteristics. Using La1–xCaxMnO3 as an example, it is shown that the switching on of electric and magnetic fields during a first-order phase transition in ferromagnetic semiconductors is accompanied by the appearance of self-oscillations of the electric current and magnetization.

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“…In the case of first-order phase transitions a short-range order with local magnetization is observed in ferromagnetic semiconductors [8]. A feature of phase transitions in ferromagnetic semiconductors is the emergence of strongly nonlinear current-voltage curves in electric field, which are noticeably affected by magnetic field [9,10].…”

Section: Introductionmentioning

confidence: 99%

First Order Phase Transition in Ferromagnetic Semiconductors in External Electric and Magnetic Fields (by the example of La-=SUB=-1-x-=/SUB=-Ca-=SUB=-x-=/SUB=-MnO-=SUB=-3-=/SUB=-) (on the example of La-=SUB=-1-x-=/SUB=-Ca-=SUB=-x-=/SUB=-MnO-=SUB=-3-=/SUB=-)

Povzner

Volkov

E.I.

et al. 2023

Physics of the Solid State

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It is shown that during a first-order phase transition in ferromagnetic semiconductors based on lanthanum manganites, along with the semiconductor phase of s-electrons, a phase arises with fluctuation short-range order associated with a change in the sign of the intermode interaction parameter in the system of d-electrons. The phase separation region is characterized by fluctuations of local magnetization depending on temperature and external magnetic field. In this case, the temperature of the first order phase transition, above which phase separation arises, is appreciably affected by double exchange. Due to self-heating, the phase separation is significantly affected by the electric field, which leads to N-shaped current-voltage characteristics. Using La1-xCaxMnO3 as an example, it is shown that the switching on of electric and magnetic fields during a first-order phase transition in ferromagnetic semiconductors is accompanied by the appearance of self-oscillations of the electric current and magnetization. Keywords: double exchange, electron fluctuations of spin and charge density, Anderson localization, self-oscillations.

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Magnetoresistance of substituted lanthanum manganites La0.7Ca0.3MnO3 upon nonequilibrium overheating of carriers

Cited by 4 publications

References 13 publications

Enhancing of magnetic flux pinning in YBa2Cu3O7−x/CuO granular composites

Enhancing of magnetic flux pinning in YBa2Cu3O7−x/CuO granular composites

Фазовый переход первого рода в ферромагнитных полупроводниках во внешних электрическом и магнитном полях (на примере La-=SUB=-1-x-=/SUB=-Ca-=SUB=-x-=/SUB=-MnO-=SUB=-3-=/SUB=-)

First Order Phase Transition in Ferromagnetic Semiconductors in External Electric and Magnetic Fields (by the example of La-=SUB=-1-x-=/SUB=-Ca-=SUB=-x-=/SUB=-MnO-=SUB=-3-=/SUB=-) (on the example of La-=SUB=-1-x-=/SUB=-Ca-=SUB=-x-=/SUB=-MnO-=SUB=-3-=/SUB=-)

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