Positive magnetoconductivity and inelastic scattering time at low temperatures with magnetic field in InSb semiconductor

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.

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

Mathematical and Computational Applications ◽

10.3390/mca26020047 ◽

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.

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Rigorous study of the spin- Ising model in a layered magnetic field at low temperatures

Journal of Physics A General Physics ◽

10.1088/0305-4470/30/4/009 ◽

1997 ◽

Vol 30 (4) ◽

pp. 1059-1068 ◽

Cited By ~ 1

Author(s):

Lahoussine Laanait ◽

Najem Moussa

Keyword(s):

Magnetic Field ◽

Ising Model ◽

Low Temperatures ◽

Rigorous Study

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LOW-TEMPERATURE NORMAL-STATE HALL EFFECT IN HIGH-TcBi2Sr2-xLaxCuO6+δ REVEALED BY 60 T MAGNETIC FIELDS

International Journal of Modern Physics B ◽

10.1142/s0217979202013845 ◽

2002 ◽

Vol 16 (20n22) ◽

pp. 3171-3174

Author(s):

F. F. BALAKIREV ◽

J. B. BETTS ◽

G. S. BOEBINGER ◽

S. ONO ◽

Y. ANDO ◽

...

Keyword(s):

Magnetic Field ◽

Low Temperature ◽

Carrier Concentration ◽

Hall Coefficient ◽

Normal State ◽

Ground State ◽

Low Temperatures ◽

Optimal Doping ◽

Underdoped Sample ◽

Additional Support

We report low-temperature Hall coefficient in the normal state of the high-Tc superconductor Bi 2 Sr 2-x La x CuO 6+δ. The Hall coefficient was measured down to 0.5 K by suppressing superconductivity with a 60 T pulsed magnetic field. The carrier concentration was varied from overdoped to underdoped regimes by partially substituting Sr with La in a set of five samples. The observed saturation of the Hall coefficient at low temperatures suggests the ability to extract the carrier concentration of each sample. The most underdoped sample exhibits a diverging Hall coefficient at low temperatures, consistent with a depletion of carriers in the insulating ground state. The Hall number exhibits a sharp peak providing additional support for the existence of a phase boundary at the optimal doping.

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Optimization of Sample Holder Materials for Sensitive Magnetometry Measurements at Low Temperatures

MRS Proceedings ◽

10.1557/proc-825-g5.5 ◽

2004 ◽

Vol 825 ◽

Cited By ~ 1

Author(s):

I. Bossi ◽

N.R. Dilley ◽

J. R. O'Brien ◽

S. Spagna

Keyword(s):

Magnetic Field ◽

Low Temperatures ◽

Magnetic Response ◽

Sample Holder ◽

Magnetization Measurements ◽

Temperature Range ◽

Paramagnetic Impurities ◽

Fused Quartz

AbstractMagnetization measurements were performed as a function of magnetic field H and temperature T on samples of nine different materials including clear fused quartz, cartridge brass, G-10 glass-reinforced epoxy, acetal homopolymer, glass-filled acetal, phenolic, and other plastics. A small yet distinct amount of ferromagnetic or paramagnetic impurities is observed in all the materials investigated in this study except quartz. In contrast, the magnetic response of quartz is typical of a diamagnet over the temperature range 5 K to 300 K. The volume susceptibility is equal to −4.4×10−7 (cgs) over the whole temperature range.

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