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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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01 Jan 2004
TL;DR: In this article, the authors proposed a new approach to the Defect Chemistry of Doped La1-DeltaMnO3+delta (Ln = La, Pr and M = Ni, Co) using the Laue method.
Abstract: Contributing Authors. Preface. Acknowledgements. Oxide Components for the Solid Oxide Fuel Cell J.B. Goodenough. Vacancy Segregation at Grain Boundaries in Ceramic Oxides N.D. Browning, et al. Metallic Conductivity and Magnetism: The Great Potential of Manganese and Cobalt Perovskites B. Raveau. Raman Diagnostics of LaCoO3 Based Properties N. Orlovskaya, D. Steinmetz. Mobility and Reactivity of the Surface and Lattice Oxygen of Some Complex Oxides with Perovskite Structure V.A. Sadykov, et al. LaFeO3 and LaCoO3 Based Perovskites: Preparation and Properties of Dense Oxygen Permeable Membranes K. Wiik, et al. Optimisation of Perovskite Materials for Fuel Electrodes S.W. Tao, J.T.S. Irvine. Single Crystal Growth of Oxides and Refractory Materials G. Balakrishnan, et al. Ionic Transport in Perovskite-Related Mixed Conductors: Ferrite-, Cobaltite-, Nickelate- and Gallate-Based Systems A. Kovalevsky, et al. Structural/Property Relationships of the Mixed Electronic/Ionic Conductors Based on Lanthanum Gallate N. Sammes. Microwave-Assisted Regeneration of Soot Filters Y. Zhang-Steenwinkel, et al. Microheterogeneous Solid Solutions in Perovskites: Formation, Microstructure and Catalytic Activity L.A. Isupova, et al. Phase Transitions and Ion Transport in SrFe1-xMx)2.5, Where M = Ga, Cr M.V. Patrakeev, et al. Connection of Giant Volume Magnetostriction with Colossal Magnetoresistance in Manganites L.I. Koroleva. SOFC Perspectives in Ukraine O.D. Vasylyev. Measurement of Oxygen Ionic Transport in Mixed Conductors E. Naumovich, et al. A New Approach to the Defect Chemistry of Doped La1-DeltaMnO3+delta K. Nakamura. Structure, Microstructure and Transport Properties of Mixed Conducting Lanthanum Gallate Based Perovskite Ceramics E.D. Politova, et al. Synthesis Structure Peculiarities of (La, Sr)MnO3 Based Nanomanganites I. Danilenko, et al. Nanoscale Magnetism and Magnetotransport Phenomena of (LaSr)MnO Compact V. Krivoruchko, et al. LSGM Single Crystals: Crystal Structure, Thermal Expansion, Phase Transitions and Conductivity L. Vasylechko, et al. Real Structure of LSGMO Crystal Studied by Laue Method D. Savytskii, et al. Microwave Regeneration of Diesel Soot Filters L.M. van der Zande, et al. Oxygen Transport in Composite Materials for Oxygen Separators and Syngas Membranes M. Dhallu, et al. Pulsed Lased Deposition of MIEC Sr4Fe6O13+-d Epitaxial Thin Films J.A. Pardo, et al. The Development of Gas Tight Thin Films of (La,Sr)(Ga,Fe)O3, (La,Sr)(Co,Fe)O3, and La2NiO4 for Oxygen Separation R. Muydinov, et al. Investigation into Thermal Expansion and Sintering of La2Mo4+d (Ln = La, Pr and M = Ni, Co) I.J.E. Brooks, et al. Oxide Ion Transport in Novel K2NiF4-Type Oxides C.N. Munnings, et al. Conductivity and Electronic Structure of Lanthanum Nickelites A.V. Zyrin, et al. Defect Chemistry of Mixed Ionic/Electronic P-Type Oxides H.U. Anderson, et al. Authors Index. Notes.

42 citations

Journal ArticleDOI
TL;DR: Evidence for unconventional magnetoresistance of double-walled carbon nanotubes under a magnetic field as large as 50 T is presented and interpreted by means of theoretical calculations.
Abstract: We report on the first experimental study of the magnetoresistance of double-walled carbon nanotubes under magnetic field as large as 50 Tesla. By varying the field orientation with respect to the tube axis, or by gate-mediated shifting the Fermi level position, evidences for unconventional magnetoresistance are presented and interpreted by means of theoretical calculations.

42 citations

Journal ArticleDOI
TL;DR: Large-scale Monte Carlo simulation results for the two-orbital model for manganites, including Jahn-Teller lattice distortions, are presented, finding the colossal magnetoresistance (CMR) phenomenon to be of first order in some portions of the phase diagram.
Abstract: Large-scale Monte Carlo simulation results for the two-orbital model for manganites, including Jahn-Teller lattice distortions, are presented here. At hole density $x=1/4$ and in the vicinity of the region of competition between the ferromagnetic metallic and spin-charge-orbital ordered insulating phases, the colossal magnetoresistance (CMR) phenomenon is observed with a magnetoresistance ratio $\ensuremath{\sim}10\text{ }000%$. Our main result is that this CMR transition is found to be of first order in some portions of the phase diagram, in agreement with early results from neutron scattering, specific heat, and magnetization, thus solving a notorious discrepancy between experiments and previous theoretical studies. The first order characteristics of the transition survive, and are actually enhanced, when weak quenched disorder is introduced.

42 citations

Journal ArticleDOI
TL;DR: The spin dynamics of La 1- x Sr x MnO 3 for Sr concentrations of x ≤ 0.3 were studied by inelastic neutron scattering as discussed by the authors, and it was shown that the spin-wave stiffness constant D and the paramagnetic spin-diffusion constant A * are ruled by the nearest neighbor interaction, i.e., the strength of double exchange interactions.
Abstract: The spin dynamics of La 1- x Sr x MnO 3 for Sr concentrations of x ≤0.3 were studied by inelastic neutron scattering. For the entire concentration range studied, we found that the spin-wave stiffness constant D and the paramagnetic spin-diffusion constant A * are ruled by the nearest neighbor interaction, i.e., the strength of double exchange interactions. The Sr concentration dependence of both the constants, D and A * , scale that of the Curie temperature T C very well, and the ratios T C M F / T C ( T C M F : Mean field T C determined from D ) and A * / T C fit in the universal table for typical transition metal ferromagnets.

42 citations

Journal Article
TL;DR: Yang et al. as discussed by the authors studied the control of the magnetic and magnetotransport properties of La 0.67 Sr 0.33 MnO 3 (LSMO) thin films through strain engineering.
Abstract: Strain engineering to control the magnetic and magnetotransport properties of La 0.67 Sr 0.33 MnO 3 thin films F. Yang 1 , N. Kemik 1 , M.D. Biegalski 2 , H.M. Christen 2 , E. Arenholz 3 , Y. Takamura 1 Department of Chemical Engineering and Materials Science, University of California–Davis, Davis, California 95616, USA Center for Nanophase Materials Science, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA Advanced Light Source, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA This work studies the control of the magnetic and magnetotransport properties of La 0.67 Sr 0.33 MnO 3 thin films through strain engineering. The strain state is characterized by the tetragonal distortion (c/a ratio), which can be varied continuously between a compressive strain of 1.005 to a tensile strain of 0.952 by changing the type of substrate, the growth rate, and the presence of an underlying La 0.67 Sr 0.33 FeO 3 buffer layer. Increasing tensile tetragonal distortion of the La 0.67 Sr 0.33 MnO 3 thin film decreases the saturation magnetization, changes the temperature dependence of the resistivity and magnetoresistance, and increases the resistivity by several orders of magnitude. The perovskite oxides have been widely investigated in recent years since they possess various important physical properties such as ferromagnetism, superconductivity, and ferroelectricity. 1 In particular, La 0.67 Sr 0.33 MnO 3 (LSMO) is an attractive candidate for spintronic devices 2,3 because it displays colossal magnetoresistance (CMR) and half-metallicity, and possesses a Curie temperature, T C, above room temperature (~ 360 K). 4,5 In this material, the T C marks the transition between the ferromagnetic (FM)/ metallic and the paramagnetic (PM)/ insulating states, as well as the peak in the CMR. This correlation between the electrical and magnetic properties is explained by the double-exchange mechanism 6,7 which involves the hopping of electrons between Mn 3+ and Mn 4+ ions with parallel spin through a bridging O 2- ion. Due to the strong interactions between the charge and orbital degrees of freedom, these properties can be manipulated by a number of different parameters, including external pressure 8 , oxygen stoichiometry 9 , and the doping level. 10,11 With thin films, the epitaxial strain imposed from the underlying substrate provides an additional tuning parameter for the functional properties. It has been shown that coherently strained LSMO thin films can be grown on a wide range of different single crystal oxide substrates and that the resulting strain dramatically impacts the magnetic and magnetotransport properties of the thin films. 12-16 The strain state can be characterized by the tetragonal distortion, defined as the c/a ratio, where the in-plane lattice parameter of the film, a, is dictated by the lattice parameter of the substrate, and the out-of-plane lattice parameter, c, is allowed to respond accordingly. For example, Kwon et al. reported that an in-plane easy magnetization direction is observed in tensile-strained films (c/a ratio 1) grown on (001)-oriented LaAlO 3 (LAO) substrates exhibit an out-of-plane easy axis. 12 Furthermore, it has been shown that the magnitude of this tetragonal distortion depends on the crystallographic orientation of the film and the substrate. 13,14,17 Fully strained LSMO films grown on (110)-oriented substrates show enhanced electrical and magnetic properties due to the reduced tetragonal distortion relative to the films grown on (001)-oriented substrates. Previously, Takamura et al. 15 showed that a dramatic change in the properties of LSMO films occurred as the c/a ratio decreased from 0.984 to 0.962. However, the strain states were limited to discrete values corresponding to the lattice parameters of the commercially available single crystal oxide substrates, STO and DyScO 3 , respectively, therefore intermediate strain states were not available. One alternative involves using piezoelectric substrates such as Pb(Mg 1/3 Nb 2/3 ) 0.72 Ti 0.28 O 3 , which allow for the dynamic modulation of the strain by varying the applied electric field. 16 However, the crystalline quality of the LSMO films grown on these piezoelectric substrates suffers due to the large lattice mismatch and the rhombohedral structure of the substrate. Furthermore, the brittleness of the substrates limits the practical range of strain that can be attained. In this work, we demonstrate the ability to control the epitaxial strain of LSMO thin films continuously over a large range through the choice of substrate, the growth rate, and the presence of an underlying La 0.7 Sr 0.3 FeO 3 (LSFO) buffer layer. Bulk LSMO has a rhombohedral perovskite structure which can be approximated as

42 citations


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Performance
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No. of papers in the topic in previous years
YearPapers
202330
202252
202139
202038
201937
201837