Electronic Properties of Icosahedral Mg-Ai-Zn Alloys

1986 ◽  
Vol 80 ◽  
Author(s):  
David V. Baxter ◽  
J. O. Ström-Olsen
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Metallic Glass ◽  
Electronic Properties ◽  
Low Temperatures ◽  
Weak Localization ◽  
Compositional Dependence ◽  
Sample Geometry ◽  
The Absolute ◽  
Zn Alloys

AbstractThe resistivity and magnetic susceptibility of icosahedral Mg32(Al1-xZnx)49 have been measured for compositions between x=0.5 and x=0.69. Both quantities exhibit a stronger compositional dependence than do the same properties of the similar metallic glass Mg1-xZnx. The resistivity at low temperatures displays the classic behaviour as a function of temperature and magnetic field associated with the phenomenon of weak localization, and we are able to use this fact to measure the absolute resistivity in a way which is independent of sample geometry.

43Ca NMR Study of Bismuth-Based High-Tc Superconductors

1994 ◽  
Vol 49 (1-2) ◽  
pp. 373-378 ◽  
Author(s):  
A. Trokiner ◽  
L. Le Noc ◽  
A. Yakubovskii ◽  
K.N. Mykhalyov ◽  
S.V. Verkhovskii
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Electronic Properties ◽  
High Tc Superconductors ◽  
High Tc ◽  
Structural Assignment ◽  
Bismuth Compounds ◽  
Nmr Study

Abstract As a first step of a study of the electronic properties of CuO2 planes by probing calcium nuclei in the bismuth-based high-Tc materials we report here the structural assignment of Ca NMR lines measured in 43Ca-enriched samples of n = 2 ((Bi,Pb)2Sr2CaCu2O8+x) and n = 3 ((Bi,Pb)2Sr2-Ca2Cu3O10+x) bismuth compounds. Powdered samples were investigated as well as oriented pow­ ders, achieved by uniaxial alignment of the grains in a 7T magnetic field. For the main calcium site (Ca between two CuO2 planes), we could determine the quadrupolar as well as the shift tensors. The results indicate that, in the same way as yttrium nuclei in YBaCuO, calcium nuclei are sensitive to the magnetic susceptibility of the metallic CuO2 planes.

Structure and Magnetism of Cs2KCr(CN)6 at Very Low Temperatures

1987 ◽  
Vol 40 (7) ◽  
pp. 1277 ◽  
Author(s):  
PJ Brown ◽  
BN Figgis ◽  
JB Forsyth
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Neutron Diffraction ◽  
Field Strength ◽  
Magnetic Field Strength ◽  
Low Temperatures ◽  
Coordination Geometry ◽  
Ground Term ◽  
Magnetic Exchange ◽  
Exchange Effect

The structure of the elpasolite Cs2KCr(CN)6 has been determined at 7.0 K by neutron diffraction. 877 unique reflections refined to Rw = 0.020, Χ = 1.4. The Cr(CN)6 unit is close to regular octahedral coordination geometry, with bond lengths of 207.4(4) for Cr-C and 116.6(6) pm for C-N. The C-Cr-C angles average to 90.0(5)� and the Cr-C-N angles to 178.3(1)�. The magnetic susceptibility as a function of temperature and the magnetization as a function of magnetic field strength correspond to the 4A2g ground term perturbed by a small magnetic exchange effect.

Energy behavior with magnetic field of negatively charged magnetoexcitons in quantum wells and heterojunctions

1999 ◽  
Vol 588 ◽  
Author(s):  
F. M. Munteanu ◽  
Y. Kim ◽  
C. H. Perry ◽  
D. G. Rickel ◽  
J. A. Simmons ◽  
...  
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Quantum Well ◽  
Quantum Wells ◽  
Low Temperatures ◽  
High Magnetic Fields ◽  
Crossing Over ◽  
Sample Geometry ◽  
Energy Behavior

AbstractWe present the results of the magneto-photoluminescence measurements performed on modulation doped GaAs/AlGaAs heterostructures in high magnetic fields (up to 60T) and low temperatures (0.37−1.5K). With increasing magnetic field we observe the formation of the triplet and singlet states of negatively charged magneto-excitons (X−) in addition to the neutral exciton (X0). Their behavior with field strongly depends on the sample geometry. In the case of a modulation doped quantum well (QW) with a well-width of 200A, the and states cross at a magnetic field of about 40T, whereas for a modulation-doped single heterojunction (SHJ) these states show no crossing over the whole range of available fields.

MAGNETIC FIELD DEPENDENT RELAXATION TIME IN p-InSb AT LOW TEMPERATURES

1981 ◽  
Vol 42 (C5) ◽  
pp. C5-689-C5-693
Author(s):  
J. D.N. Cheeke ◽  
G. Madore ◽  
A. Hikata
Keyword(s):  
Magnetic Field ◽  
Relaxation Time ◽  
Low Temperatures ◽  
Field Dependent

An Augmented Iteratively Re-weighted and Refined Least Squares Method for lp Minimization Problem in Inverse Modeling of Potential Field Magnetic Data

2020 ◽  
Vol 1 (3) ◽  
Author(s):  
Maysam Abedi
Keyword(s):  
Magnetic Field ◽  
Magnetic Susceptibility ◽  
Least Squares ◽  
Minimization Problem ◽  
Potential Field ◽  
Field Data ◽  
Least Squares Method ◽  
Porphyry Copper ◽  
Magnetic Data ◽  
Magnetic Field Data

The presented work examines application of an Augmented Iteratively Re-weighted and Refined Least Squares method (AIRRLS) to construct a 3D magnetic susceptibility property from potential field magnetic anomalies. This algorithm replaces an lp minimization problem by a sequence of weighted linear systems in which the retrieved magnetic susceptibility model is successively converged to an optimum solution, while the regularization parameter is the stopping iteration numbers. To avoid the natural tendency of causative magnetic sources to concentrate at shallow depth, a prior depth weighting function is incorporated in the original formulation of the objective function. The speed of lp minimization problem is increased by inserting a pre-conditioner conjugate gradient method (PCCG) to solve the central system of equation in cases of large scale magnetic field data. It is assumed that there is no remanent magnetization since this study focuses on inversion of a geological structure with low magnetic susceptibility property. The method is applied on a multi-source noise-corrupted synthetic magnetic field data to demonstrate its suitability for 3D inversion, and then is applied to a real data pertaining to a geologically plausible porphyry copper unit.  The real case study located in  Semnan province of  Iran  consists  of  an arc-shaped  porphyry  andesite  covered  by  sedimentary  units  which  may  have  potential  of  mineral  occurrences, especially  porphyry copper. It is demonstrated that such structure extends down at depth, and consequently exploratory drilling is highly recommended for acquiring more pieces of information about its potential for ore-bearing mineralization.

Simple Systems

2017 ◽  
Author(s):  
Jochen Rau
Keyword(s):  
Magnetic Field ◽  
Low Temperatures ◽  
General Framework ◽  
Gibbs State ◽  
Macroscopic System ◽  
Basic Model ◽  
System A ◽  
Paramagnetic Salt ◽  
High And Low Temperatures ◽  
Simple Systems

Even though the general framework of statistical mechanics is ultimately targeted at the description of macroscopic systems, it is illustrative to apply it first to some simple systems: a harmonic oscillator, a rotor, and a spin in a magnetic field. These applications serve to illustrate how a key function associated with the Gibbs state, the so-called partition function, is calculated in practice, how the entropy function is obtained via a Legendre transformation, and how such systems behave in the limits of high and low temperatures. After discussing these simple systems, this chapter considers a first example where multiple constituents are assembled into a macroscopic system: a basic model of a paramagnetic salt. It also investigates the size of energy fluctuations and how—in the case of the paramagnet—these fluctuations scale with the number of constituents.

scholarly journals Review of Multi-Physics Modeling on the Active Magnetic Regenerative Refrigeration

2021 ◽  
Vol 26 (2) ◽  
pp. 47
Author(s):  
Julien Eustache ◽  
Antony Plait ◽  
Frédéric Dubas ◽  
Raynal Glises
Keyword(s):  
Magnetic Field ◽  
Low Temperatures ◽  
Room Temperature ◽  
State Of The Art ◽  
Vapor Compression ◽  
Crucial Step ◽  
Potential Alternative ◽  
Vapor Compression Refrigeration ◽  
Preliminary Study ◽  
Physics Modeling

Compared to conventional vapor-compression refrigeration systems, magnetic refrigeration is a promising and potential alternative technology. The magnetocaloric effect (MCE) is used to produce heat and cold sources through a magnetocaloric material (MCM). The material is submitted to a magnetic field with active magnetic regenerative refrigeration (AMRR) cycles. Initially, this effect was widely used for cryogenic applications to achieve very low temperatures. However, this technology must be improved to replace vapor-compression devices operating around room temperature. Therefore, over the last 30 years, a lot of studies have been done to obtain more efficient devices. Thus, the modeling is a crucial step to perform a preliminary study and optimization. In this paper, after a large introduction on MCE research, a state-of-the-art of multi-physics modeling on the AMRR cycle modeling is made. To end this paper, a suggestion of innovative and advanced modeling solutions to study magnetocaloric regenerator is described.

Magnetic susceptibility of a linear chain antiferromagnet, TANOL, at very low temperatures

1976 ◽  
Vol 41 (2) ◽  
pp. 354-356 ◽  
Author(s):  
Masafumi Kumano ◽  
Yusaku Ikegami ◽  
Takashi Sato ◽  
Shinhachiro Saito
Keyword(s):  
Magnetic Susceptibility ◽  
Low Temperatures ◽  
Linear Chain
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