Results 21 to 30 of about 9,208 (237)
Percolation mechanism for colossal magnetoresistance [PDF]
Computational Materials Science, 1998 We argue that colossal magnetoresistance is a critical phenomenon and propose a mechanism to describe it. The mechanism relies on the halfmetallic behavior of the materials showing colossal magnetoresistance, and yields a correlated percolation model that, we argue, captures all qualitative features of colossal magnetoresistance, above as well as below
Bastiaansen, Paul J. M. +1 more
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Colossal Magnetoresistance and Quenched Disorder in Manganese Oxides [PDF]
ChemInform, 2005 AbstractFor Abstract see ChemInform Abstract in Full Text.
Nobuo Furukawa, Yukitoshi Motome
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Striping of orbital-order with charge-disorder in optimally doped manganites
Nature Communications, 2021 Manganite perovskites display the intriguing property of colossal magnetoresistance (CMR), but only at very specific doping values. Now, a detailed crystallographic analysis of a prototype system reveals a novel type of orbital ordering that coexists ...
Wei-Tin Chen +6 more
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Influence of Mn site doping on electrical resistivity of polycrystalline La1-yAyMn1-xBxO3 (A=Ba, Sr; B=Cu, Cr, Co) Manganites [PDF]
Science of Sintering, 2008 We have the measured electrical resistivity of La1-yBayMn1-xCuxO3 (0.17≤y≤0.30; 0.04≤x≤0.10), La1-ySryMn1-xCrxO3 and La1-ySryMn1-xCoxO3 (0.270≤y≤0.294; 0.02≤x≤0.10) polycrystalline samples in the 25-325 K temperature range. The increase of Mn site doping
Paunović N. +3 more
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Hidden Charge-Order in the Mixed-Valent K<sub>0.75</sub>Li<sub>2</sub>Cr<sub>6</sub>O<sub>12</sub> High-Pressure Oxide. [PDF]
Adv Sci (Weinh)K0.75Li2Cr6O12 is one of the few mixed valent chromium oxides. It shows a single angle spiral magnetic structure with a k = [1/3 1/3 ¼] propagation vector. Density functional theory reveals a hidden charge order that is necessary to stabilize the antiferromagnetic (AFM) ground state.
Arévalo-López AM +3 more
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Colossal Magnetoresistance in Manganites as a Multicritical Phenomenon [PDF]
Physical Review Letters, 2003 The colossal magnetoresistance in manganites AMnO_3 is studied from the viewpoint of multicritical phenomena. To understand the complicated interplay of various phases, we study the Ginzburg-Landau theory in terms of both the mean-field approximation and the renormalization-group analysis to compare with the observed phase diagram.
Murakami, Shuichi, Nagaosa, Naoto
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Communications Physics, 2023 In the model manganese perovskites La1−x Ca x MnO3, several important phenomena have been observed, including ferromagnetic metallic/insulating states, colossal magnetoresistance effects, and charge- and orbital-ordered states.
Michael Pissas +2 more
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Nanomaterials, 2021 Epitaxial La0.7Sr0.3MnO3 films with different thicknesses (9–90 nm) were deposited on SrTiO3 (0 0 1) substrates by pulsed laser deposition. The films have been investigated with respect to morpho-structural, magnetic, and magneto-transport properties ...
Simona Gabriela Greculeasa +7 more
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Critical Nucleation in Colossal Magnetoresistance [PDF]
, 2003 Critical exponents have been obtained for a 3D spin particle system. Clusters are formed and system reaches a critical behavior when fragment size distribution follows a power law, as predicted by Fisher Liquid Droplet Model. Also, spontaneous magnetization critical temperature is in agreement with other theoretical studies.
Armando Barrañón +3 more
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Spin colossal magnetoresistance in an antiferromagnetic insulator [PDF]
Nature Materials, 2018 Colossal magnetoresistance (CMR) refers to a large change in electrical conductivity induced by a magnetic field in the vicinity of a metal-insulator transition and has inspired extensive studies for decades\cite{Ramirez1997, Tokura2006}. Here we demonstrate an analogous spin effect near the Néel temperature $T_{\rm{N}}$=296 K of the antiferromagnetic ...
Zhiyong Qiu +5 more
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