The Anomalous Hall Effect (AHE) is an important quantity in determining the properties and understanding the behaviour of the two-dimensional electron system forming at the interface of SrTiO
In this paper we study LaAlO$_3$/Eu$_{1-x}$La$_x$TiO$_3$/SrTiO$_3$ structures with nominally x = 0, 0.1 and different thicknesses of the Eu$_{1-x}$La$_x$TiO$_3$ layer. We observe that both systems have many properties similar to previously studied LaAlO$_3$/EuTiO$_3$/SrTiO$_3$ and other oxide interfaces, such as the formation of a 2D electron liquid for 1 or 2 unit cells of Eu$_{1-x}$La$_x$TiO$_3$; a metal-insulator transition driven by the thickness increase of Eu$_{1-x}$La$_x$TiO$_3$ layer; the presence of an Anomalous Hall effect (AHE) when driving the systems above the Lifshitz point with a backgate voltage; and a minimum in the temperature dependence of the sheet resistance below the Lifshitz point in the one-band regime, which becomes more pronounced with increasing gate voltage. However, and notwithstanding the likely presence of magnetism in the system, we do not attribute that minimum to the Kondo effect, but rather to the properties of SrTiO$_3$ crystal and the inevitable effects of charge trapping when using back gates.
We investigated the method for herbaceous cellulose production by the thermomechanochemical activation in the pilot plant ASHB (screw boiling apparatus). The process flow scheme for the herbaceous cellulose production (horizontal configuration of thread) and the working project were developed based on it. The technology can be used for production of semicellulose and cellulose out of straw of bast crops, grain varieties, bluegrass and cruciferous plants. The physicochemical and physicomechanical characteristics of the herbaceous cellulose are provided.
The electric-field tunable Rashba spin-orbit coupling at the ${\mathrm{LaAlO}}_{3}/{\mathrm{SrTiO}}_{3}$ interface shows potential applications in spintronic devices. However, different gate dependence of the coupling strength has been reported in experiments. On the theoretical side, it has been predicted that the largest Rashba effect appears at the crossing point of the ${d}_{\text{xy}}$ and ${d}_{\text{xz},\text{yz}}$ bands. In this work, we study the tunability of the Rashba effect in ${\mathrm{LaAlO}}_{3}/{\mathrm{SrTiO}}_{3}$ by means of backgating. The Lifshitz transition was crossed multiple times by tuning the gate voltage so that the Fermi energy is tuned to approach or depart from the band crossing. By analyzing the weak antilocalization behavior in the magnetoresistance, we find that the maximum spin-orbit coupling effect occurs when the Fermi energy is near the Lifshitz point. Moreover, we find strong evidence for a single spin winding at the Fermi surface.
Abstract We have studied the transport properties of LaTiO 3 /SrTiO 3 (LTO/STO) heterostructures. In spite of 2D growth observed in reflection high energy electron diffraction, transmission electron microscopy images revealed that the samples tend to amorphize. Still, we observe that the structures are conducting, and some of them exhibit high conductance and/or superconductivity. We established that conductivity arises mainly on the STO side of the interface, and shows all the signs of the two-dimensional electron gas usually observed at interfaces between STO and LTO or LaAlO 3 , including the presence of two electron bands and tunability with a gate voltage. Analysis of magnetoresistance (MR) and superconductivity indicates the presence of spatial fluctuations of the electronic properties in our samples. That can explain the observed quasilinear out-of-plane MR, as well as various features of the in-plane MR and the observed superconductivity.
Abstract Methods for regulating the cows’ reproductive function have been introduced into agricultural practice long ago. In most cases, the schemes existing in the Republic of Belarus are used in dairy farming. The present study is aimed at studying the effectiveness of using the “CO-Synch” scheme with subsequent resynchronization on Limousine beef cows and heifers using pharmacological agents, taking into account the animals age and the calving season. It has been found that the use of the sexual cyclicity synchronization-stimulation “CO-Synch” scheme contributed to the achievement of cows’ breeding efficiency in 43.9–55.5% of cases. The initial injection of hormonal preparations to heifers has contributed to fertile conception in 9.0–12.5–47.6% of cases. Resynchronization has increased their breeding efficiency to 50.0–63.6%. The best breeding efficiency of 60.0–61.5% has been observed in cows aged 5–9 years. Pregnancy has been found in 75.0% of animals calved in winter, 71.9% in spring, and 66.7% in summer.
This study presents a novel approach to detect partial discharges (PD) in a medium-voltage (MV) cable termination using fiber optic-based acoustic PD sensors. The sensing system is designed by the company Optics11. It is a commercial off-the-shelf product under the trademark name of OptiFender, which uses non-metallic, passive fiber opticbased acoustic sensors, which are galvanically isolated. Given these properties, OptiFender sensors can be installed directly on the cable accessories. The sensors can withstand the curing conditions of the filling compound used in the cable accessories, making them suitable for both retrofitting and embedding applications. In this study, defect terminations with PD were investigated. Several OptiFender sensors were installed all around the defect termination, and all of them could detect partial discharge with a sufficient signal-to-noise ratio (SNR). The termination was operated at medium voltages, with PD levels of from a few pC up to around 100 pC, but the application of OptiFender is not limited to only medium voltages, and there have been examples of using the same sensors at voltages of up to 400 kV. All the sensors picked up PD with a high SNR. Acoustic PD sensors provide an indirect measure of the PD activity by measuring the released energy of the partial discharge in the acoustic domain, rather than the traditional direct measurement of the displaced charge. The OptiFender system can provide uninterrupted, continuous, and unsupervised monitoring of electrical assets for both indoor and outdoor applications.
The Anomalous Hall Effect (AHE) is an important quantity in determining the properties and understanding the behavior of the two-dimensional electron system forming at the interface of SrTiO3-based oxide heterostructures. The occurrence of AHE is often interpreted as a signature of ferromagnetism, but it is becoming more and more clear that also paramagnets may contribute to AHE. We studied the influence of magnetic ions by measuring intermixed LaAlO3/GdTiO3/SrTiO3 at temperatures below 10 K. We find that, as function of gate voltage, the system undergoes a Lifshitz transition, while at the same time an onset of AHE is observed. However, we do not observe clear signs of ferromagnetism. We argue the AHE to be due to the change in Rashba spin-orbit coupling at the Lifshitz transition and conclude that also paramagnetic moments which are easily polarizable at low temperatures and high magnetic filds lead to the presence of AHE, which needs to be taken into account when extracting carrier densities and mobilities.
We introduce a novel modality in the CVD growth of graphene which combines the cold-wall and hot-wall reaction chambers. This hybrid mode preserves the advantages of a cold-wall chamber as the fast growth and low fuel consumption, but boosts the quality of the growth towards conventional CVD with hot-wall chambers. The synthesized graphene is uniform and monolayer. The electronic transport measurements shows great improvements in charge carrier mobility compared to graphene synthesized in a normal cold-wall reaction chamber. Our results promise the development of a fast and cost-efficient growth of high quality graphene, suitable for scalable industrial applications.
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