Possible universal behavior of magnetoresistance and resistivity isotherms in magnetic materials

Krichene, A.; Boujelben, W.; Shah, N.A.; Solanki, P.S.

doi:10.1016/j.jallcom.2019.153400

Cited by 21 publications

(8 citation statements)

References 41 publications

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“…Several theoretical models have been proposed to explain the behavior of MR as a function of the applied magnetic field. − The phase-separated manganites are magnetically inhomogeneous systems in which different magnetic/electronic phases can coexist together; Krichene et al proposed a simple phenomenological model in order to describe the magnetic field dependence of negative MR and resistivity isotherms. The present model works even for samples showing complex magnetic behaviors such as CO, magnetic PS, and training effect.…”

Section: Resultsmentioning

confidence: 99%

Enhancement of the Magnetotransport Behavior in a Phase-Separated LaAgCaMnO₃ Polycrystalline: Unraveling the Role of a Multi-Double-Exchange Mechanism

et al. 2020

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Manganese-based perovskite oxides have attracted much attention since the phenomenon of colossal magnetoresistance (CMR) was revived, where the magnetoresistance (MR) can attend higher orders of magnitude larger than that typically found in other types of materials. While trying to understand the mechanism behind CMR, morphostructural, magnetoelectrical, and theoretical studies have been performed on the La 0.4 Ag 0.2 Ca 0.4 MnO 3 (LACMO) sample. An orthorhombic-shaped singlephase LACMO sample with size distribution D SEM = 2.5 μm was synthesized using a conventional sol−gel chemical method. The mixed valence states of different chemical elements were revealed by X-ray photoemission spectroscopy. The results of thermal dependence of magnetization were obtained according to the zero field cooled−field cooled cooling−field cooled warming protocols using a superconducting quantum interference device magnetometer. The phase separation (PS) phenomenon was observed because of the competition between the superexchange and the double-exchange (DE) mechanisms within the same material. Field dependence of magnetization at varying temperatures and in cooling−warming processes has also been reported and discussed in this paper. The MR value was found to be 99% under an applied field of 2 T. In essence, the reported CMR arises from the metal−insulator phase transition T ρ = 64 K, which accompanies the transition from an insulator state to a metallic state. Not only the large CMR value was noted in our sample, but also the high obtained value of the temperature coefficient of resistivity of 69% at 123 K in zero field has also been reported. The obtained CMR values are the result of PS and multi-DE phenomenon. The latter proved to be directly correlated with the improved magnetotransport properties because an additional hopping mechanism is provided by an interstitially filled Mn 2+ ion, which is electronically involved in the conduction mechanism, showing an unconventional behavior in the transport properties of manganite.

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Section: Resultsmentioning

confidence: 99%

Enhancement of the Magnetotransport Behavior in a Phase-Separated LaAgCaMnO₃ Polycrystalline: Unraveling the Role of a Multi-Double-Exchange Mechanism

et al. 2020

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“…This fact indicates that magnetic field cycling transforms some AFM domains to the FM state. Such a phenomenon is frequently observed in phase-separated manganites and is known as the training effect. − ,,− During sequence (3), magnetization values for positive field values are higher than those recorded in sequence (1). This indicates that some AFM domains are definitively converted to the FM state.…”

Section: Resultsmentioning

confidence: 99%

Suppression of Metamagnetic Transitions of Martensitic Type by Particle Size Reduction in Charge-Ordered La_0.5Ca_0.5MnO₃

et al. 2020

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In this paper, we have studied the effect of size reduction on charge ordering (CO) and magnetic phase separation in La 0.5 Ca 0.5 MnO 3 . The magnetic ground state at low temperature shifts from ferromagnetic (nanoparticles) to CO-antiferromagnetic (bulk) with increasing annealing temperature. The studied samples exhibit relevant phenomena such as Griffiths phase and training effect. Magnetic field cycling can stabilize ferromagnetic or antiferromagnetic domains, depending on the temperature value as well as the sample's nature. For the compound sintered at 1200 °C, step-like metamagnetic transitions of martensitic type were observed at 4 K, indicating the presence of weak spin-phonon coupling. The disappearance of magnetic phase separation at 4 K (the sample is purely antiferromagnetic) can be a possible origin for the occurrence of such transitions. Lowering the sintering temperature leads to the disappearance of martensitic transitions. The obtained results indicate that the occurrence of step-like metamagnetic transition of martensitic type necessarily requires the onset of a long-range CO-antiferromagnetic state.

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“…However, neither final field derivative d(MR)/dB nor any term of it followed the experimental results of SFMO thin films deposited onto various single-crystal substrates. [18] Another phenomenological model for manganites and ferromagnetic alloys [19] is founded on the decomposition of MR into two distinct components: the low-field and high-field MR at a given temperature both represented as MR ∝ B q /(B c q þ B q ). Here, B c is a critical field at which the value of the MR has fallen by half and q is an exponent which is different for the low-and high-field MRs. For experimental data of (Ba 0.8 Sr 0.2 ) 2 FeMoO 6 measured up to 50 T, [20] the MR above a critical field of 0.65 T is well fitted to the phenomenological model assuming MR max ¼ -41.4%.…”

Section: Introductionmentioning

confidence: 99%

Magnetoresistance of Nanosized, Granular Sr₂FeMoO_6–δ–SrMoO₄ Core–Shell Structures

Suchaneck

Artiukh

2021

Physica Status Solidi (b)

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Herein, for the first time, a model is developed for the description of magnetoresistance in nanosized, granular Sr 2 FeMoO 6-δ -SrMoO 4 core-shell structures, which is based on the fluctuation-induced tunneling model. Parameters of the fluctuation-induced tunneling model of granular materials are calculated. The magnetic field is considered to affect the tunneling barrier height. The linear and quadratic coefficients of this effect are estimated.

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Possible universal behavior of magnetoresistance and resistivity isotherms in magnetic materials

Cited by 21 publications

References 41 publications

Enhancement of the Magnetotransport Behavior in a Phase-Separated LaAgCaMnO₃ Polycrystalline: Unraveling the Role of a Multi-Double-Exchange Mechanism

Enhancement of the Magnetotransport Behavior in a Phase-Separated LaAgCaMnO₃ Polycrystalline: Unraveling the Role of a Multi-Double-Exchange Mechanism

Suppression of Metamagnetic Transitions of Martensitic Type by Particle Size Reduction in Charge-Ordered La_0.5Ca_0.5MnO₃

Magnetoresistance of Nanosized, Granular Sr₂FeMoO_6–δ–SrMoO₄ Core–Shell Structures

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Possible universal behavior of magnetoresistance and resistivity isotherms in magnetic materials

Cited by 21 publications

References 41 publications

Enhancement of the Magnetotransport Behavior in a Phase-Separated LaAgCaMnO3 Polycrystalline: Unraveling the Role of a Multi-Double-Exchange Mechanism

Enhancement of the Magnetotransport Behavior in a Phase-Separated LaAgCaMnO3 Polycrystalline: Unraveling the Role of a Multi-Double-Exchange Mechanism

Suppression of Metamagnetic Transitions of Martensitic Type by Particle Size Reduction in Charge-Ordered La0.5Ca0.5MnO3

Magnetoresistance of Nanosized, Granular Sr2FeMoO6–δ–SrMoO4 Core–Shell Structures

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Enhancement of the Magnetotransport Behavior in a Phase-Separated LaAgCaMnO₃ Polycrystalline: Unraveling the Role of a Multi-Double-Exchange Mechanism

Enhancement of the Magnetotransport Behavior in a Phase-Separated LaAgCaMnO₃ Polycrystalline: Unraveling the Role of a Multi-Double-Exchange Mechanism

Suppression of Metamagnetic Transitions of Martensitic Type by Particle Size Reduction in Charge-Ordered La_0.5Ca_0.5MnO₃

Magnetoresistance of Nanosized, Granular Sr₂FeMoO_6–δ–SrMoO₄ Core–Shell Structures