Topic
Colossal magnetoresistance
About: Colossal magnetoresistance is a research topic. Over the lifetime, 3658 publications have been published within this topic receiving 130104 citations.
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21 citations
TL;DR: In this article, the Griffiths-like phase was observed in bilayered manganites at the same temperature T * ≥ 350K, independent of doping level and anisotropy, which is due to intrinsic inhomogeneity caused by quenched disorder.
Abstract: The authors report the observation of a Griffiths-like phase in La2−2xSr1+2xMn2O7 (x=0.30, 0.33, and 0.40) and (La0.8Eu0.2)2−2xSr1+2xMn2O7 (x=0.33) single crystals by means of electron spin resonance, magnetic susceptibility, and magnetoresistance measurements. In the temperature region TC
21 citations
TL;DR: In this paper, the influence of the mean size of the interpolated cation (Nd, Ca, Sr) on the magnitude of the resistance ratios (RR) was demonstrated for the first time.
Abstract: The systematic study of the manganese perovskite Nd0.7Ca0.3−xSrxMnO3−δ has allowed colossal magnetoresistance effects (CMR) with resistance ratios (RR), RB=0/RB=5T, up to 104 at 60 K in a field of 5 tesla to be evidenced. The influence of the mean size of the interpolated cation (Nd, Ca, Sr), on the magnitude of the RR ratios, has been demonstrated for the first time: RR goes through a maximum for a particular value of the mean radius of the interpolated cation. This effect seems to be correlated with the evolution of the cell volume that exhibits a singular point around x=0.085. A second important feature deals with the irreversibility of the CMR effect at low temperature that decreases as T increases and disappears at Tmax. It is also remarkable that for ρ(T) curves characterized by a maximum, Tmax not only increases as the size of the interpolated cation increases, but also as the magnitude of the applied magnetic field increases.
21 citations
TL;DR: In this paper, a new metal-organic chemical vapour deposition (MOCVD) technique was used for fabrication of epitaxial La-manganite thin films La 1− x MnO 3−δ with both lanthanum and oxygen deficiencies.
21 citations
TL;DR: In this paper, the ferromagnetic ordering temperature and the characteristics of the magnetization curve in La 2/3 Ca 1/3 MnO 3 thin films were tailored to fit the ordering temperature of the lattice lattice.
Abstract: Doped manganese oxides represent a class of materials with a wealth of ordering phenomena including spin-, charge-and orbital ordering, all coupled to lattice properties. The possibility to grow epitaxial thin films paves the way to introduce controllable epitaxial strain and to artificially modify the film properties. In three examples this is demonstrated and discussed in the paper. First, tailoring the ferromagnetic ordering temperature and the characteristics of the magnetization curve in La 2/3 Ca 1/3 MnO 3 thin films, second, the pressure sensitivity of resistivity in strained La 2/ 3 Ca 1/3 MnO 3 thin films. Finally, using films grown on vicinal cut substrates, anisotropic properties of strained films are studied and thermoelectric voltages can be measured. These examples pave the way to new types of applications of colossal magnetoresistance thin films beyond spintronics.
21 citations