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The Origin of the Giant Hall Effect in Metal-Insulator Composites 被引量:1
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作者 Joachim Sonntag 《Open Journal of Composite Materials》 2016年第3期78-90,共13页
Near the metal-insulator transition, the Hall coefficient R of metal-insulator composites (M-I composite) can be up to 104 times larger than that in the pure metal called Giant Hall effect. Applying the physical model... Near the metal-insulator transition, the Hall coefficient R of metal-insulator composites (M-I composite) can be up to 104 times larger than that in the pure metal called Giant Hall effect. Applying the physical model for alloys with phase separation developed in [1] [2], we conclude that the Giant Hall effect is caused by an electron transfer away from the metallic phase to the insulating phase occupying surface states. These surface states are the reason for the granular structure typical for M-I composites. This electron transfer can be described by [1] [2], provided that long-range diffusion does not happen during film production (n is the electron density in the phase A. u<sub>A </sub>and u<sub>B</sub> are the volume fractions of the phase A (metallic phase) and phase B (insulator phase). β is a measure for the average potential difference between the phases A and B). A formula for calculation of R of composites is derived and applied to experimental data of granular Cu<sub>1-y</sub>(SiO<sub>2</sub>)<sub>y</sub> and Ni<sub>1-y</sub>(SiO<sub>2</sub>)<sub>y</sub> films. 展开更多
关键词 Metal-Insulator Composites Granular Metals hall coefficient CONDUCTIVITY Electron Density
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Structural and electrical transport properties of Cu-doped Fe1-xCuxSe single crystals
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作者 He Li Ming-Wei Ma +2 位作者 Shao-Bo Liu Fang Zhou Xiao-Li Dong 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第12期103-106,共4页
We report the structural and electrical transport properties of Fe1-xCuxSe(x=0,0.02,0.05,0.10)single crystals grown by a chemical vapor transport method.Substituting Cu for Fe suppresses both the nematicity and superc... We report the structural and electrical transport properties of Fe1-xCuxSe(x=0,0.02,0.05,0.10)single crystals grown by a chemical vapor transport method.Substituting Cu for Fe suppresses both the nematicity and superconductivity of FeSe single crystal,and provokes a metal–insulator transition.Our Hall measurements show that the Cu substitution also changes an electron dominance at low temperature of un-doped Fe Se to a hole dominance of Cu-doped Fe1-xCuxSe at x=0.02 and 0.1,and reduces the sign-change temperature(TR)of the Hall coefficient(RH). 展开更多
关键词 iron-based superconductivity crystal growth element substitution hall coefficient
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The Research of Spin-Orbital Interaction in Intermetallic Compounds of System Gd-In on Paramagnetic Area
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作者 ОblokulКuvadikovichКuvadikov Nurliboy Sadiyevich Hamraev +1 位作者 Abdugani Abayevich Eshkulov Rustam Mustaffaevich Rajabov 《材料科学与工程(中英文B版)》 2020年第3期106-108,共3页
Normal,R0,and anomalous,RS,components of the Hall coefficient are determined from the results of experimental investigations of temperature dependences of the Hall coefficient,magnetic susceptibility,and specific elec... Normal,R0,and anomalous,RS,components of the Hall coefficient are determined from the results of experimental investigations of temperature dependences of the Hall coefficient,magnetic susceptibility,and specific electrical resistance for intermetallic Gd3In,Gd3In5 and GdIn3 compounds.Effective parameters of spin-orbital interactionλSO of intermetallic compounds are calculated from anomalous components RS of the Hall coefficient and specific electrical resistance.The results calculated for the band parameters and effective parameters of spin-orbital interactionλSO for Gd-In system intermetallides coincide by orders of magnitude with the results obtained from the optical spectra of pure REMs(rare-earth metals). 展开更多
关键词 hall coefficient specific electrical resistance magnetic susceptibility effective spin-orbital interaction parameter
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