Topic
Magnetocapacitance
About: Magnetocapacitance is a research topic. Over the lifetime, 497 publications have been published within this topic receiving 23846 citations.
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TL;DR: In this article, the frequency dependence of capacitance between two-dimensional electron systems and the gate has been studied at the quantum Hall (QH) plateaus, and the relationship between σ xx and capacitance has been discussed.
Abstract: The frequency dependence of the capacitance between two-dimensional electron systems (2DESs) and the gate has been studied at the quantum Hall (QH) plateaus. The capacitance minima at the QH plateaus are highly dependent on the area of edge channels at high frequencies. The residual contribution of bulk channel to the capacitance has been estimated, and the widths of edge channels have been evaluated. The diagonal conductivity σ xx of less than 10 -11 S has been obtained accurately by capacitance measurements at the QH plateaus. The relationship between σ xx and capacitance has been discussed.
4 citations
TL;DR: The capacitance and dielectric loss tangent of Gd x Mn1-S (x ≤ 0.2) solid solutions have been measured at a frequency of 10 kHz without magnetic field and in a magnetic field of 8 kOe in the temperature range of 90-450 K.
Abstract: The capacitance and dielectric loss tangent of Gd x Mn1–x S (x ≤ 0.2) solid solutions have been measured at a frequency of 10 kHz without magnetic field and in a magnetic field of 8 kOe in the temperature range of 90–450 K. An increase in the permittivity and a dielectric loss maximum have been detected in the low-temperature region. It has been found that the temperature of the maximum of the imaginary part of the permittivity shifts to higher temperatures with increasing concentration. The magnetocapacitance effect has been revealed for two compositions. The dielectric loss has been described in the Debye model with “freezing” dipole moments and in the orbital-charge ordering model.
4 citations
TL;DR: In this paper, the magnetic and dielectric properties of BaCo 2 Si 2 O 7 single crystal with a quasi-one-dimensional structure were investigated to explore novel magnetoelectric functionality.
Abstract: We have investigated the magnetic and dielectric properties of BaCo 2 Si 2 O 7 single crystal with a quasi-one-dimensional structure to explore novel magnetoelectric functionality. The Weiss temperatures estimated in paramagnetic region are - 20 K ( H ∥ c ) and - 74 K ( H ⊥ c ) , indicating the large magnetic anisotropy due to the highly anisotropic structure. The weak ferromagnetic magnetization rises up at 21 K, where the dielectric constant perpendicular to the c-axis decreases concomitantly. In addition, we have observed the magnetocapacitance effect below 21 K. Δ e ( H ) / e ( 0 ) reaches 0.2% at 5.5 K. These results suggest that there exists a substantial coupling between magnetism and dielectricity.
4 citations
TL;DR: In this paper, the de Gennes spin order is associated with the formation of canted antiferromagnetic spin order preceded by charge ordering in La 0.5Ba0.5FeO3 synthesized by conventional solid state reaction route.
Abstract: We report multifunctional properties of the charge disproportionate correlated electronic system La0.5Ba0.5FeO3 synthesized by conventional solid state reaction route. The bulk sample undergoes semiconductor–metal like transition at TSM = 102 K showing appreciable magnetoresistance (∼20%) around TSM even at a low field (∼0.5 T). A crossover of electrical conduction mechanism from Mott’s variable range hopping to small polaron hopping occurs around 210 K, well above TSM. Analysis of the transport, magnetic susceptibility, and magnetization data in the light of de Gennes proposal indicates the formation of canted antiferromagnetic spin order preceded by charge ordering in La0.5Ba0.5FeO3. Nonsaturation behavior and nonlinearity of the M-H curve at low temperature and at high field (∼5 T), confirms the canted spin order. The observed resistive transition is considered to be associated with the onset of weak ferromagnetic ordering in the canted antiferromagnetic spin state of the materials. Moreover, novel fer...
4 citations
01 Jun 2017
TL;DR: In this article, it was shown that a finite imbalance between electron densities in the K and K' valleys of bilayer graphene induces a magnetoelectric coupling, which augments current understanding of longitudinal magnetoresistance and magnetocapacitance in unconventional materials.
Abstract: It was recently shown that a finite imbalance between electron densities in the K and K' valleys of bilayer graphene induces a magnetoelectric coupling. Here we explore ramifications of this electronically tunable magnetoelectric effect for the optical conductivity and dielectric permittivity of this material. Our results augment current understanding of longitudinal magnetoresistance and magnetocapacitance in unconventional materials.
4 citations