Thermopower measurements on small samples

Henkie, Z.; Markowski, P.J.; Wojakowski, A.; Laurent, C.

doi:10.1088/0022-3735/20/1/006

Cited by 16 publications

(6 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thermoelectric power measurements were performed using a modified version of the equipment described by Henkie et al [12]. The bar-shaped sample was placed between two reference blocks of an Ag 97 Au 3 alloy [13].…”

Section: Methodsmentioning

confidence: 99%

Specific heat, susceptibility, magnetotransport and thermoelectric power of the Kondo alloys (Ce_1 xLa_x)Cu₅In

Tchokonté

Plessis

Strydom³

et al. 2004

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

The influence of substituting Ce with La in the Kondo compound CeCu5In has been investigated using x-ray diffraction, specific heat (Cp), electrical resistivity (ρ(T)), magnetoresistivity (MR) and thermoelectric power (TEP) measurements. Cp of CeCu5In and the (Ce1−xLax)Cu5In alloys shows enhanced values at low temperatures. Between 10 and 20 K the equation Cp/T = γconv+βT2 fits the data for all alloys with γconv scaling linearly with Ce concentration. Below 10 K a pronounced upturn in Cp values occurs. Susceptibility data above 100 K follow the Curie–Weiss relation and give effective moment μeff values in fair agreement with that of a Ce3+-ion. The ρ(T) studies illustrate the evolution from Kondo lattice to single-ion Kondo behaviour with increase in La content in the (Ce1−xLax)Cu5In alloy series. MR measurements on Ce dilute alloys are interpreted within the single-ion Bethe ansatz description and values of the Kondo temperature TK are calculated. A compressible Kondo lattice model has been used to describe the decrease in TK and in Tmρ (the temperature at which a maximum in ρ(T) occurs for the coherent dense Kondo alloys) with decrease in Ce concentration for these alloys. The TEP is positive and shows a maximum at approximately 45 K for several investigated (Ce1−xLax)Cu5In alloys.

show abstract

Section: Methodsmentioning

confidence: 99%

Specific heat, susceptibility, magnetotransport and thermoelectric power of the Kondo alloys (Ce_1 xLa_x)Cu₅In

Tchokonté

Plessis

Strydom³

et al. 2004

J. Phys.: Condens. Matter

View full text Add to dashboard Cite

show abstract

“…10 Small temperature gradients ⌬T were measured with a AuFe-chromel thermocouple and voltages induced across the sample ⌬V were measured with a Solatron 7071 voltmeter using a AgAu reference wire. The absolute value of TEP was calculated as S(T)ϭS AgAu (T)Ϫ⌬V/⌬T, where S AgAu (T) was determined using YBCO superconductor and Cu reference below and above 90 K, respectively.…”

Section: Methodsmentioning

confidence: 99%

Magnetic, electrical transport, and thermal properties of a uranium intermetallic compoundUCu5In

et al. 2001

View full text Add to dashboard Cite

A ternary intermetallic compound UCu 5 In has been studied by means of magnetization, electrical resistivity, magnetoresistivity, thermopower, thermal conductivity, heat-capacity, and thermal-expansion measurements. The experimental findings reveal UCu 5 In to be antiferromagnetically ordered (T N ϭ25 K) dense Kondo system (T K ϭ24 K) with a considerable enhancement of the effective mass of conduction electrons at low temperatures, yielding the Sommerfeld coefficient ␥(0) of about 240 mJ/͑mole K 2 ). Although the electrical resistivity and the thermopower of UCu 5 In shows features characteristic of interplay of Kondo and crystal-field effects, the magnetoresistivity does not exhibit behavior expected for Kondo systems being large and positive even well above T N . Consistent explanation of the latter results is attempted by considering the role of magnetic precursor effects and/or interfacelike effects due to the presence of nonmagnetic layers.

show abstract

“…The sample holder consists of two low power heaters A and B (15 each). The temperature (T) of the heaters A and B is measured by thermocouple and the temperature gradient between A and B is measured by differential temperature sensor [25][26]. As pointed out, the quantity S can be used to determine the mobility ratio, the concentration of carriers, the position of dominant carriers or the type of dominant electronic conduction.…”

Section: Result -Structural Studies X-ray Diffractogram (Xrd)mentioning

confidence: 99%

Study of structural, electrical, and optical properties of nickel-doped tin selenide crystals

2016

View full text Add to dashboard Cite

Nickel-doped tin selenide crystals can be grown using the direct vapour transport technique. This paper includes structural, electrical, and optical characterizations of SnSeNi0.2 crystals done by X-ray diffraction (XRD), energy-dispersive analysis of X-rays (EDAX), surface microstructure topography, Hall effect measurement carried out to determine type of material, Seebeck coefficient and calculation of power factor has been carried out from the data of thermoelectric power measurements and the ultraviolet–visible (UV-Vis) spectroscopic technique, respectively. The optical absorption spectrum was obtained in an UV-Vis–near-infrared (NIR) spectrometer in the range of 200–2500 nm. The UV-Vis spectroscopic technique has been used to calculate band gap, and the value of the band gap was found to be 0.84 eV in the visible region. Calculation of various optical parameters has been carried out.

show abstract

Thermopower measurements on small samples

Cited by 16 publications

References 2 publications

Specific heat, susceptibility, magnetotransport and thermoelectric power of the Kondo alloys (Ce_1 xLa_x)Cu₅In

Specific heat, susceptibility, magnetotransport and thermoelectric power of the Kondo alloys (Ce_1 xLa_x)Cu₅In

Magnetic, electrical transport, and thermal properties of a uranium intermetallic compoundUCu5In

Study of structural, electrical, and optical properties of nickel-doped tin selenide crystals

Contact Info

Product

Resources

About

Thermopower measurements on small samples

Cited by 16 publications

References 2 publications

Specific heat, susceptibility, magnetotransport and thermoelectric power of the Kondo alloys (Ce1 xLax)Cu5In

Specific heat, susceptibility, magnetotransport and thermoelectric power of the Kondo alloys (Ce1 xLax)Cu5In

Magnetic, electrical transport, and thermal properties of a uranium intermetallic compoundUCu5In

Study of structural, electrical, and optical properties of nickel-doped tin selenide crystals

Contact Info

Product

Resources

About

Specific heat, susceptibility, magnetotransport and thermoelectric power of the Kondo alloys (Ce_1 xLa_x)Cu₅In

Specific heat, susceptibility, magnetotransport and thermoelectric power of the Kondo alloys (Ce_1 xLa_x)Cu₅In