scholarly journals Quantum interference from sums over closed paths for electrons on a three-dimensional lattice in a magnetic field: Total energy, magnetic moment, and orbital susceptibility

1996 ◽  
Vol 53 (20) ◽  
pp. 13374-13385 ◽  
Author(s):  
Yeong-Lieh Lin ◽  
Franco Nori
Keyword(s):  
Magnetic Field ◽  
Total Energy ◽  
Magnetic Moment ◽  
Quantum Interference ◽  
Three Dimensional ◽  
Dimensional Lattice

Motion of a charged particle in superposed Heliotron and biconical cusp fields

1969 ◽  
Vol 3 (2) ◽  
pp. 255-267 ◽  
Author(s):  
M. P. Srivastava ◽  
P. K. Bhat
Keyword(s):  
Magnetic Field ◽  
Charged Particle ◽  
Magnetic Moment ◽  
Particle Trajectory ◽  
Three Dimensional ◽  
Equation Of Motion ◽  
Neutral Point ◽  
Two Dimensional ◽  
Axially Symmetric ◽  
Hybrid Type

We have studied the behaviour of a charged particle in an axially symmetric magnetic field having a neutral point, so as to find a possibility of confining a charged particle in a thermonuclear device. In order to study the motion we have reduced a three-dimensional motion to a two-dimensional one by introducing a fictitious potential. Following Schmidt we have classified the motion, as an ‘off-axis motion’ and ‘encircling motion’ depending on the behaviour of this potential. We see that the particle performs a hybrid type of motion in the negative z-axis, i.e. at some instant it is in ‘off-axis motion’ while at another instant it is in ‘encircling motion’. We have also solved the equation of motion numerically and the graphs of the particle trajectory verify our analysis. We find that in most of the cases the particle is contained. The magnetic moment is found to be moderately adiabatic.

Room Temperature Sample Scanning SQUID Microscope for Imaging the Magnetic Fields of Geological Specimens

2013 ◽  
Vol 475-476 ◽  
pp. 3-6 ◽  
Author(s):  
Qing Meng Wang ◽  
Hua Feng Qin ◽  
Qing Song Liu ◽  
Tao Song
Keyword(s):  
Magnetic Field ◽  
Low Temperature ◽  
Magnetic Fields ◽  
Liquid Helium ◽  
Quantum Interference ◽  
Three Dimensional ◽  
Input Circuit ◽  
Pickup Coil ◽  
Weak Magnetic Fields ◽  
Scanning Squid

A microscope to image weak magnetic fields using a low-temperature superconducting quantum interference device (SQUID) had developed with a liquid helium consumption rate of ~0.5L/hour. The gradient pickup coil is made by a low-temperature superconducting niobium wire with a diameter of 66 μm, which is coupled to the input circuit of the SQUID and is then enwound on the sapphire bobbin. Both of the pickup coil and the SQUID sensor are installed in a red copper cold finger, which is thermally anchored to the liquid helium evaporation platform in the vacuum space of the cryostat. To reduce the distance between the pickup coil and sample, a 100 μm thick sapphire window is nestled up to the bottom of the cryostat. A three-dimensional scanning stage platform with a 50 cm Teflon sample rack under the sapphire window had the precision of 10 μm. To test the fidelity of the new facility, the distribution of the magnetic field of basalt slice specimens was determined. Results show that the spatial resolution of the newly-designed facility is 500 μm with a gradient magnetic field sensitivity of 380fT. This opens new opportunities in examining the distribution of magnetic assemblages in samples, which bear great geological and geophysical information.

Magnetic moment of a three-dimensional quantum well in a quantizing magnetic field

1998 ◽  
Vol 244 (4) ◽  
pp. 295-302 ◽  
Author(s):  
L.I. Filina ◽  
V.A. Geyler ◽  
V.A. Margulis ◽  
O.B. Tomilin
Keyword(s):  
Magnetic Field ◽  
Quantum Well ◽  
Magnetic Moment ◽  
Three Dimensional ◽  
Quantizing Magnetic Field

scholarly journals Сверхпроводящие свойства In, наноструктурированного в порах тонких пленок из микросфер SiO-=SUB=-2-=/SUB=-

2018 ◽  
Vol 60 (10) ◽  
pp. 1900
Author(s):  
Н.Ю. Михайлин ◽  
С.Г. Романов ◽  
Ю.А. Кумзеров ◽  
А.В. Фокин ◽  
Д.В. Шамшур
Keyword(s):  
Magnetic Field ◽  
Magnetic Moment ◽  
Three Dimensional ◽  
Critical Magnetic Field ◽  
Critical Parameters ◽  
Dimensional Dependence ◽  
Continuous Current ◽  
Step Transition ◽  
First Time ◽  
The Magnetic Field

AbstractSamples of a superconducting indium nanocomposite based on a thin-film porous dielectric matrix prepared by the Langmuir–Blodgett method are obtained for the first time, and their low-temperature electrophysical and magnetic properties are studied. Films with thickness b ≤ 5 μm were made from silicon dioxide spheres with diameter D = 200 and 250 nm; indium was introduced into the pores of the films from the melt at a pressure of P ≤ 5 kbar. Thus, a three-dimensional weakly ordered structure of indium nanogranules was created in the pores, forming a continuous current-conducting grid. Measurements of the temperature and magnetic field dependences of the resistance and magnetic moment of the samples showed an increase in the critical parameters of the superconductivity state of nanostructured indium (critical temperature T _c ≤ 3.62 K and critical magnetic field H_c at T = 0 K H _c(0) ≤ 1700 Oe) with respect to the massive material ( T _c = 3.41 K, H _c(0) = 280 Oe). In the dependence of the resistance on temperature and the magnetic field, a step transition to the superconductivity state associated with the nanocomposite structure was observed. A pronounced hysteresis M ( H ) is observed in the dependence of the magnetic moment M of the nanocomposite on the magnetic field at T < T _c, caused by the multiply connected structure of the current-conducting indium grid. The results obtained are interpreted taking into account the dimensional dependence of the superconducting characteristics of the nanocomposite.

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