Journal ArticleDOI
Electrical and magnetic properties of perovskite at low temperature
TLDR
In this article, the authors investigated the magnetic and electrical properties at low temperature down to 1.8 K and found that magnetic susceptibility and magnetoresistance increase with the increase of x. The increase in magnetic susceptibility is due to reduction in Mn-O-Mn bond angle and the mobility of charge carriers.Abstract:
Electrical and magnetic properties of have been extensively investigated at low temperature down to 1.8 K. The irreversibility of magnetic susceptibility between zero field cooling and field cooling increases with increasing Y content. The metal-insulator transition temperature shifts towards lower temperature and the peak resistivity and magnetoresistance increase with the increase of x. Electrical conduction above is dominated by the variable range hopping mechanism. The increase in resistivity at low temperature has been interpreted in terms of electron-electron interaction. The enhancement of magnetoresistance with the increase of Y content is due to the reduction in Mn-O-Mn bond angle and the mobility of charge carriers.read more
Citations
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Journal ArticleDOI
Low-temperature resistivity minimum in ceramic manganites
TL;DR: In this article, measurements of magnetoresistance and magnetization were carried out on ceramic samples of La0.5Pb 0.5MnO3, containing 10 at.
Journal ArticleDOI
A nature of low-temperature resistivity minimum in ceramic manganites
TL;DR: The model of spin-dependent carrier tunneling between antiferromagnetically coupled grains may account for the results observed as discussed by the authors, which is shown that the resistivity at zero applied magnetic field exhibit a shallow minimum at temperatures T about 25 K - 30 K, which shifts towards lower temperatures upon applying magnetic field and disappears at a certain (rather low) field.
Journal ArticleDOI
Low-temperature resistivity minima in single-crystalline and ceramic La0.8Sr0.2MnO3: Mesoscopic transport and intergranular tunneling
TL;DR: In this paper, the mesoscopic corrections to the bulk resistivity of a single crystal and polycrystalline samples were found to account for the results observed in the single crystal.
Journal ArticleDOI
Low-temperature resistivity of La 0.7 Sr 0.3 Mn O 3 ultra thin films: Role of quantum interference effects
Luigi Maritato,Carolina Adamo,Carlo Barone,G. M. De Luca,Alice Galdi,Pasquale Orgiani,A. Yu. Petrov +6 more
TL;DR: The low-temperature transport properties of as-grown ultrathin films, deposited by the molecular beam epitaxy, have been investigated as a function of the sample thickness as discussed by the authors.
Journal ArticleDOI
The nature of the low-temperature minimum of resistivity in ceramic manganites
TL;DR: In this article, electrical transport measurements were carried out on a ceramic sample of La 0.5 Pb 0.8 Sr 0.2 MnO 3 and showed that the resistivity at zero applied magnetic field exhibits a shallow minimum at the interval of T ∼ 25-30 K.
References
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Journal ArticleDOI
Interaction between the d -Shells in the Transition Metals. II. Ferromagnetic Compounds of Manganese with Perovskite Structure
TL;DR: In this paper, it was shown that both electrical conduction and ferromagnetic coupling in these compounds arise from a double exchange process, and a quantitative relation was developed between electrical conductivity and the Ferromagnetic Curie temperature.
Journal ArticleDOI
Disordered electronic systems
TL;DR: In this article, a review of the progress made in the last several years in understanding the properties of disordered electronic systems is presented, focusing on the metal-to-insulator transition and problems associated with the insulator.
Journal ArticleDOI
Thousandfold Change in Resistivity in Magnetoresistive La-Ca-Mn-O Films
TL;DR: A negative isotropic magnetoresistance effect has been observed in thin oxide films of perovskite-like La0.67Ca0.33MnOx, which could be useful for various magnetic and electric device applications if the observed effects of material processing are optimized.
Journal ArticleDOI
Giant negative magnetoresistance in perovskitelike La2/3Ba1/3MnOx ferromagnetic films.
R. von Helmolt,R. von Helmolt,Joachim Dr. Wecker,Joachim Dr. Wecker,B. Holzapfel,B. Holzapfel,L. Schultz,L. Schultz,Konrad Samwer,Konrad Samwer +9 more
TL;DR: The samples show a drop in the resistivity at the magnetic transition, and the existence of magnetic polarons seems to dominate the electric transport in this region.
Journal ArticleDOI
Insulator-metal transition and giant magnetoresistance in La 1-x Sr x MnO 3
TL;DR: Insulator-metal phenomena depending on band filling, temperature, and external magnetic field have been investigated for prototypical double-exchange ferromagnets, namely, crystals of crystals of La 1-x, showing large negative magnetoresistance around the ferromagnetic transition temperature.
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