Low temperature Hall measurements in a cryostat with a built-in magnet

Altwein, M.; Finkenrath, H.; Stockel, T

doi:10.1088/0022-3735/6/7/012

Cited by 12 publications

(7 citation statements)

References 10 publications

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“…A Hall field (for the entire temperature range) orthogonal to the current density is applied to generate a voltage across the sample (1 × 1 cm 2 ) and called Hall voltage (V H ). From the Hall voltage (assuming one carrier conduction theory), the carrier density (n), resistivity (ρ), and Hall mobility (μ H ) can be calculated from the equations given below 35,36…”

Section: Resultsmentioning

confidence: 99%

“…The nature of mobility indicates a predominant scattering by ionized impurities. 35 The overall mobility (μ) of the sample is represented as follows 42 In eq 6, μ p , μ dis , and μ imp are the mobility governed by phonon scattering, dislocation scattering in a semiconductor, and impurity scattering, respectively. Figure 6b shows temperature-dependent resistivity ρ(T) for untreated and treated carbon papers in a temperature range of 10−300 K. In both the samples, the resistivity decreases with an increase in temperature due to the increase of conductivity with temperature.…”

Section: R V T Ibmentioning

confidence: 99%

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Origin of the Catalytic Activity Improvement of Electrochemically Treated Carbon: An Electrical and Electrochemical Investigation

et al. 2019

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Improvement in catalytic activity of electrochemically treated carbon (relative to the untreated carbon) toward various redox reactions is widely reported in the literature. In this work, the origin of such activity enhancement due to electrochemical treatment in a 1 M H 2 SO 4 electrolyte in a potential range of 1−2.5 V is investigated using physical, electrical, and electrochemical methods. The physical characterizations suggest intercalation of anions (bisulfate) between the graphite layers from the H 2 SO 4 electrolyte. Electrical characterizations (both Hall measurement and Mott−Schottky analysis) show that the samples switch from n-type to p-type behavior upon electrochemical treatment. The improvement in the catalytic activity on electrochemical treatment of carbon is explained on the basis of the change in surface characteristics, carrier concentration (N D ), and active site density. The same is validated with oxygen reduction reaction in alkaline media.

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Section: Resultsmentioning

confidence: 99%

Section: R V T Ibmentioning

confidence: 99%

Origin of the Catalytic Activity Improvement of Electrochemically Treated Carbon: An Electrical and Electrochemical Investigation

et al. 2019

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“…The static magnetic field was produced inside a helium gas-flow-cryostat by means of a small built-in electromagnet originally designed for low-temperature Hall measurenients [4]. The static field B= I_ 0.8 T was superimposed by a very weak a.c. field B sin wt (5 < B=).…”

Section: Methodsmentioning

confidence: 99%

Temperature dependence of the magnetoresistance in CdO

Altwein

Finkenrath

Gerhardt

1978

Phys. Stat. Sol. (a)

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The transverse magnetoresistance of very narrow and very broad samples of highly degenerate CdO (carrier density a few 1019 cm−3) is measured up to 0.8 T in the temperature range 3 to 293 K. At room temperature the resistance change of almost all samples is positive and proportional to B2. With decreasing temperature Δϱ/ϱ0 becomes increasingly negative. The field dependence of the negative component agrees well with a semiempirical relation derived by Khosla and Fischer. The influence of the sample geometry upon the magnetoresistance increases considerably at lower temperatures.

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“…La distorsion est inférieure à 0,1 %.2.2 LE CHAMP MAGNÉTIQUE. -Le champ magnétique est produit par un électro-aimant placé à l'intérieur du cryostat car cette disposition permet de minimiser les pertes et d'obtenir des champs intenses à fréquence élevée[10].Cet électro-aimant est constitué d'une bobine à noyau de ferrite (du type 3 C 8) où est taillé un entrefer de 2 mm dans lequel sera placé l'échantillon à mesurer. Le type de ferrite utilisée est prévu pour fonctionner à des fréquences élevées (allant jusqu'à 50 kHz); le meilleur rendement est obtenu à des fréquences voisines de 6 kHz.…”

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Appareil de mesure d'effet Hall en alternatif. Application MoTe 2 monocristallin

Ramoul

Conan

Zoaeter

1982

Rev. Phys. Appl. (Paris)

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Un appareil de mesure d'effet Hall par la méthode double alternative a été réalisé au laboratoire. Le montage utilise un oscillateur pilote commun aux sources produisant, d'une part le courant électrique et, d'autre part, le champ magnétique dans un électro-aimant placé à l'intérieur du cryostat On obtient une résolution élevée (de l'ordre de 10 nV) sur des échantillons fortement résistifs. Des mesures sur MoTe2 monocristallin montrent une bonne linéarité courant-champ et mettent en évidence le type p du semi-conducteur

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Low temperature Hall measurements in a cryostat with a built-in magnet

Cited by 12 publications

References 10 publications

Origin of the Catalytic Activity Improvement of Electrochemically Treated Carbon: An Electrical and Electrochemical Investigation

Origin of the Catalytic Activity Improvement of Electrochemically Treated Carbon: An Electrical and Electrochemical Investigation

Temperature dependence of the magnetoresistance in CdO

Appareil de mesure d'effet Hall en alternatif. Application MoTe 2 monocristallin

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