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Thermal Properties: Thermal Expansion
Published in David A. Cardwell, David C. Larbalestier, Aleksander I. Braginski, Handbook of Superconductivity, 2022
Recent studies have shown that magnetostriction measurements of superconductors in the normal conducting state make it possible to study the Fermi surface using quantum oscillations (Zocco et al. 2013). The magnetic field-induced oscillations of the magnetostriction coefficient of KFe2As2 are shown in Figure G3.3.11 together with a Fourier analysis of the oscillation frequencies. Here, the magnetostriction coefficient is a measure of the uniaxial pressure dependence of the magnetization.
Beryllium Containing II-VI Compounds
Published in Maria C. Tamargo, II-VI Semiconductor Materials and Their Applications, 2018
The current-voltage (I-V) characteristics of a resonant tunneling diode with a thickness of 4 nm for both barrier and well are shown in Figure 23. Four peaks in the I-V characteristics can be resolved. Details of the first resonance are shown in the inset of the figure. The structure around 0.4 eV can be attributed to LO-phonon assisted tunneling. Application of a magnetic field parallel to the tunneling current reveals well-resolved quantum oscillations, shown in Figure 24.
S
Published in Philip A. Laplante, Comprehensive Dictionary of Electrical Engineering, 2018
Siemens, Ernst Werner von shotgun a specialized hot stick that is used to install a hot tap. Shubnikov-de Haas oscillation quantum oscillations in resistance as a function of applied magnetic field. shunt (1) a device having appreciable impedance connected in parallel across other devices or apparatus and diverting some of the current from it. Appreciable voltage exists across the shunted device or apparatus, and an appreciable current may exist in it. (2) an inductive element connected across a power line or bus. Those connected to buses are known as bus-connected reactors, while those connected across a power line are called lineconnected reactors. shunt capacitor a capacitor or group of capacitors which are placed across an electric power line to provide a voltage increase or to improve the power factor of the circuit. A switchable shunt may be disconnected from the circuit when conditions warrant, while a fixed shunt is permanently connected to the power line. shunt DC machine a DC machine with the field winding connected in shunt with the armature. In shunt generators, residual magnetism must be present in the machine iron in order to initiate the generation process. These machines are also known as self-excited, since they supply their own excitation. shunt field a field winding of a DC machine consisting of many turns of fine wire, connected in parallel with the armature circuit. It may be connected to the same source as the armature or a separate source. shunt peaking use of a peaking coil in a parallel tuned circuit branch connecting the output load of one amplifier stage to the input load of the following stage, in order to compensate for high frequency loss due to the distributed capacitance of the two stages. shunt reactor a reactor intended for connection in shunt to an electric system to draw inductive current. Si periodic table symbol for silicon. See silicon.
Magnetic-field-induced surface quantum states in organic conductors
Published in Philosophical Magazine, 2020
Lifshitz and Kosevich have been the first that studied the surface magnetic levels of electrons in thin films for the purpose of investigation of the de Haas-Van Alphen effect (quantum oscillations of the magnetisation) [5]. Then, Nee and Prange [6] found that transitions of surface electrons between different magnetic surface levels account for the oscillations in the surface impedance in a weak magnetic field, discovered by Khaikin [7]. Their theoretical calculations shown that when taking into account the quantisation of the periodic motion of the skipping electrons whose reflection from the surface is close to elastic (specular), the theory is found to be in good agreement with the experimentally observed oscillations of the surface impedance of metals in a weak magnetic field.
Influence of Quantum Oscillations in the Thermal Scattering Law of Zirconium Carbide on Neutron Thermalization and Criticality
Published in Nuclear Science and Engineering, 2023
J. L. Wormald, J. C. Holmes, M. L. Zerkle
The inelastic contributions to the TSLs for C(ZrC) and Zr(ZrC) are illustrated in Fig. 2 for 293.6 and 2000 K. The Zr(ZrC) is dominated by low-energy transfer for neutron scattering that approaches a FG behavior at high momentum transfer (i.e.,), which is typical of heavy nuclides in crystalline materials [e.g., U(UN) and Zr(ZrHx)]. Highly structured quantized oscillations, however, are observed in the of C(ZrC). These quantum oscillations occur at integer values (i.e., quanta) of the average energy of the optical phonon contribution to partial phonon spectra, approximately eV, such that each integer quanta from corresponds directly to the phonon order of the interaction. Downscattering () and upscattering () proceed through net emission and absorption, respectively. For low momentum transfer, illustrated with , 1-phonon interaction processes are dominant across the entire temperature range of the evaluation. However, as momentum transfer increases, discrete multiphonon interactions become likely, most prominently for downscattering. As temperature increases, high momentum transfer approaches the FG but retains low-amplitude oscillations even at 2000 K. In contrast to metal hydrides such as ZrHx where downscattering interactions due to quantum oscillations are highly favored,21 upscattering interactions are of a similar magnitude to low-energy downscattering events.
The Dirac equation as a model of topological insulators
Published in Philosophical Magazine, 2020
Xiao Yuan, M. Bowen, P. S. Riseborough
Since the Berry phase is evaluated on a closed path, it can be generated by the application of a magnetic field which, semi-classically, induces cyclotron motion on a closed path and leads to quantum oscillations.