Magnetoresistance in (La1−Ca ) MnO3 films

Lawler, J.F.; Coey, J. M. D.

doi:10.1016/0304-8853(94)01215-6

Cited by 12 publications

(9 citation statements)

References 6 publications

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“…A forced fit with t = 1.5, shown as the broken line in Fig. (4), results in x p = 0.29. Although no perfect agreement between theoretical expectations and experiment is achieved in this way, the qualitative behaviour of ρ d (x) strongly suggests that percolation plays a dominant role.…”

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confidence: 99%

“…Giant magnetoresistance is related to the spin-dependent scattering of conduction electrons between magnetically ordered layers which is strongly affected by external fields [3]. Colossal magnetoresistance is traced back to a strong coupling of the electronic subsystem to the lattice, leading to polaron formation [4]. The onset of ferromagnetic order, favored by applying external fields, induces a transition to a metallic, i.e., low resistive state.…”

mentioning

confidence: 99%

“…From fits to the experimental data for ρ(T ) for other values of x, the scaled values of ρ d (x) were evaluated and plotted in the main frame of Fig. (4). The usual Nordheim-Kurnakov relation [16] for a two component system…”

mentioning

confidence: 99%

“…The corresponding fit is represented by the dotted line in Fig. (4). A forced fit with t = 1.5, shown as the broken line in Fig.…”

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confidence: 99%

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Percolation and the Colossal Magnetoresistance of Eu-Based Hexaboride

et al. 2004

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confidence: 99%

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confidence: 99%

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confidence: 99%

“…The corresponding fit is represented by the dotted line in Fig. (4). A forced fit with t = 1.5, shown as the broken line in Fig.…”

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confidence: 99%

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Percolation and the Colossal Magnetoresistance of Eu-Based Hexaboride

et al. 2004

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“…35 MnO 3 . A value of MR ≈ 10 for pulsed laser deposited films of La 0.7 Ca 0.3 MnO 3 was reported by Lawler et al 5 Mahendiran et al 6 measured MR = 0.5 for certain samples of La 1−x Sr x MnO 3 for a range of x around 1/3, while the much larger MR = 10 was reported by Tokura et al 7 for single crystals of this material. An MR value as high as 10 4 was reported for material Nd 0.7 Sr 0.3 MnO 3 by Xiong et al 8 The term "colossal" of CMR is used to describe the large MR value in this material and to distinguish it from the "giant" MR in inhomogeneous magnetic systems.…”

Section: Perovskite Manganites With Colossal Magnetoresistancementioning

confidence: 54%

Spin and Orbital Physics in Manganites

Wang

2001

Int. J. Mod. Phys. B

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The spin and orbital physics in perovskite manganites is briefly reviewed. Perovskite manganites are well known as the materials exhibiting colossal magnetoresistance (CMR), whose mechanism is based on the double exchange (DE) interaction, in which the electron hopping is connected with the spin configurations of the manganite ions. Recent intensive studies have shown that this DE framework must be subjected to the strong correlation between orbital degenerate electrons. On one hand, the orbital degeneracy itself leads to an anisotropic DE hopping being different from the conventional DE, which in turn may result in the anisotropy of the magnetic structure, such as the A-type or the C-type antiferromagnetism. On the other hand, the electronic correlation between these degenerate electrons plays an important role in determining the phases of the system. The correlation can come from both the on-site Coulomb interaction and the Jahn-Teller coupling between the lattice distortion and the electrons. The interplay of the DE mechanism and the strong electronic correlation leads to various magnetic, orbital and/or charge ordering as well as the phase separation.

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Giant Magnetoresistance Phenomenon in Manganates

Rao¹

1996

Chemistry A European J

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The cover picture shows various stages of the mineralization/coagulation process in the kinetically controlled formation of gold nanoparticles (yellow spheres) in a microemulsion of polystyrene-block-poly(2-vinylpyridine) (green-and-white strands) in toluene. The transmission electron micrographs and the superimposed UV/Vis absorbance spectra correspond to the states with one gold particle per micelle (top) and to aggregated micelles containing two (middle) or three (bottom) gold particles. More about this novel method of stabilizing defined metal particles in 1499-1504 Giant Magnetoresistance Phenomenon in Manganates Ferromagnetism Insulator -MetalThe many complex, interrelated phenomena that contribute to giant magnetoresistance (GMR) i n rare earth manganates Ln, -,A,MnO, (Ln = rare earth, A = divalent cation) are discussed. GMR is observed when these manganates become ferromagnetic and transform from an insulating state to a metallic state close to the Curie temperature. The essential features of magnetoresistance can be understood on the basis of the double-exchange mechanism, but this is too simplistic to account for all the observed data. 1509-1513Oxygen and Nitrogen in Competitive Situations: Which Is The Hydrogen-Bond Acceptor?By utilizing a rapid redox reaction between liquid MOO, and "N3-" [Eqs. (1) and (2)], we have been able to perform the first high-temperature oxide melt solution calorimetry on ternary metal nitrides. The energetics of the Ca/Zn/N system indicate that Ca,N, acts as a basic nitride analogous to CaO in oxide systems, while Zn,N, acts as an acidic nitride (''N3-" acceptor). Further study of ternary nitride systems should enable classification of binary nitrides into those of acidic or basic character, and possibly lead to the design and synthesis of new materials. AS2-AS1 AS3-ASZ-ASI AS4-AS3-AS2-ASlA matched set of isomers-porphyrin (l), porphycene (Z), and corrphycene (3)-allow various issues in porphyrin chemistry to be explored. In this paper the doubly protonated forms of these macrocycles, studied as their tetraethyl-tetramethyl derivatives, are compared. as the formal oxidant has been developed. In this mild ruthenium-catalyzed procedure, which utilizes catalyst/substrate ratios as low as I/lOOO, alcohols with oxidation-sensitive functionalities can be selectively oxidized to ketones (above). The cleavage of an amide bond catalysed aspartylglucosaminidase (AGA) has been investigated with ab initio quantum mechanical calculations (model used shown on the right). It is shown that catalytic mechanisms similar to those of serine proteases are feasible for AGA and other N-terminal nucleophilic (Ntn) amidohydrolases. It is also suggested that the protonated cr-amino group of the substrate may be important for the catalytic activity of AGA. Kinetically controlled formation of gold nanoparticles in a microemulsion of polystyrene-block-poly(2-vinylpyridine) in toluene is described for the first time. Various stages of the mineralization/coagulation process could be stabilized, namely,...

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Magnetoresistance in (La1−Ca ) MnO3 films

Cited by 12 publications

References 6 publications

Percolation and the Colossal Magnetoresistance of Eu-Based Hexaboride

Percolation and the Colossal Magnetoresistance of Eu-Based Hexaboride

Spin and Orbital Physics in Manganites

Giant Magnetoresistance Phenomenon in Manganates

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