Large thermoelectric power in several metallic compounds of cerium and uranium

Bandô, Yoshio; Suemitsu, T.; Takagi, Kenta; Tokushima, H; Echizen, Y.; Katoh, K.; Umeo, Kazunori; Maeda, Y.; Takabatake, Toshiro

doi:10.1016/s0925-8388(00)01176-2

Cited by 44 publications

(28 citation statements)

References 22 publications

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“…These both data could be fairly well fitted by means of two band model, described in Ref. [33]. On this basis the energy parameters like the difference between the electronic levels (E f − E F ) and the width of the 5f electron bands Δ, could be determined.…”

Section: Electron and Heat Transport Propertiesmentioning

confidence: 77%

The possibility of the mixed valence state in the uranium intermetallic compounds: UCoGa5, U2Ru2Sn and U2RuGa8

Troć

2007

Journal of Alloys and Compounds

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Section: Electron and Heat Transport Propertiesmentioning

confidence: 77%

The possibility of the mixed valence state in the uranium intermetallic compounds: UCoGa5, U2Ru2Sn and U2RuGa8

Troć

2007

Journal of Alloys and Compounds

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“…Before explaining this behavior, we make reference to the electrical resistivity measurements of CeRhSn (inset of Fig. 8) [36]. For this ternary stannide, the ρ versus T plot was reported for a polycrystalline sample: in the first case, ρ(T ) decreases practically linearly with decreasing temperature from 300 to 90 -100 K, then more rapidly at lower temperatures.…”

Section: Magnetic Measurementsmentioning

confidence: 96%

Cerium Valence Change in the Solid Solutions Ce(Rh_1-xRux)Sn

Niehaus

Abdala

Riecken

et al. 2013

Zeitschrift Für Naturforschung B

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The solid solutions Ce(Rh 1−x Ru x )Sn were investigated by means of susceptibility measurements, specific heat, electrical resistivity, X-ray absorption spectroscopy (XAS), and 119 Sn Mössbauer spectroscopy. Magnetic measurements as well as XAS data show a cerium valence change in dependence on the ruthenium content. Higher ruthenium content causes an increase from 3.22 to 3.45 at 300 K. Furthermore χ and χ −1 data indicate valence fluctuation for cerium as a function of temperature. For example, Ce(Rh 0.8 Ru 0.2 )Sn exhibits valence fluctuations between 3.42 and 3.32 in the temperature range of 10 to 300 K. This could be proven by using the interconfiguration fluctuation (ICF) model introduced by Sales and Wohlleben. Cerium valence change does not influence the tin atoms as proven by 119 Sn Mössbauer spectroscopy, but it influences the electrical properties. Ce(Rh 0.9 Ru 0.1 )Sn behaves like a typical valence fluctuating compound, and higher ruthenium content causes an increase of the metallic behavior.

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“…The large TEP was attributed to the strong scattering of conduction electrons by the 4f electrons in the vicinity of Fermi level [595]. The temperature dependence of thermo power for valence fluctuating Ce has been explained by two-band conductor model assuming a single Lorentzian 4f band [595].…”

Section: Thermopower Thermal Expansion and Hall Measurementsmentioning

confidence: 97%

Review on magnetic and related properties of RTX compounds

Gupta

Суреш

2015

Journal of Alloys and Compounds

256

124

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RTX (R=rare earths, T= 3d/4d/5d, transition metals such as Sc, Ti, Mn, Fe, Co, Ni, Cu, Ru, Rh, Pd, Ag, Os, Ir, Pt, Au, and X=p-block elements such as Al, Ga, In, Si, Ge, Sn, As, Sb, Bi) series is a huge family of intermetallics compounds. These compounds crystallize in different crystal structures depending on the constituents. Though these compounds have been known for a long time, they came to limelight recently in view of the large magnetocaloric effect (MCE) and magnetoresistance (MR) shown by many of them. Most of these compounds crystallize in hexagonal and tetragonal crystal structures. Some of them show crystal structure modification with annealing temperature; while a few of them show iso-structural transition in the paramagnetic regime. Their magnetic ordering temperatures vary from very low temperatures to temperatures well above room temperature (~510 K). Depending on the crystal structure, they show a variety of magnetic and electrical properties.These compounds have been characterized by means of a variety of techniques/measurements such as x-ray diffraction, neutron diffraction, magnetic properties, heat capacity, magnetocaloric properties, electrical resistivity, magnetoresistance, thermoelectric power, thermal expansion, Hall effect, optical properties, XPS, Mössbauer spectroscopy, ESR, μSR, NMR, NQR etc. Some amount of work on theoretical calculations on electronic structure, crystal field interaction and exchange interactions has also been reported. The interesting aspect of this series is that they show a variety of physical properties such as Kondo effect, heavy fermion behavior, spin glass state, intermediate valence, superconductivity, multiple magnetic transitions, metamagnetism, large MCE, large positive as well as negative MR, spin orbital compensation, magnetic polaronic behavior, pseudo gap effect etc.Except Mn, no other transition metal in these compounds possesses considerable magnetic moments.Because of this RMnX compounds in general have high ordering temperatures. Interstitial modification using hydrogen and nitrogen is found to alter their crystal structures and magnetic properties considerably. RTX compounds also show interesting pressure effects on their structural and magnetic properties. In summary, these compounds show variety of physical properties over a wide range of temperatures. This review is intended to cover all the important results obtained in this family, particularly in the last few years.

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Large thermoelectric power in several metallic compounds of cerium and uranium

Cited by 44 publications

References 22 publications

The possibility of the mixed valence state in the uranium intermetallic compounds: UCoGa5, U2Ru2Sn and U2RuGa8

The possibility of the mixed valence state in the uranium intermetallic compounds: UCoGa5, U2Ru2Sn and U2RuGa8

Cerium Valence Change in the Solid Solutions Ce(Rh_1-xRux)Sn

Review on magnetic and related properties of RTX compounds

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Large thermoelectric power in several metallic compounds of cerium and uranium

Cited by 44 publications

References 22 publications

The possibility of the mixed valence state in the uranium intermetallic compounds: UCoGa5, U2Ru2Sn and U2RuGa8

The possibility of the mixed valence state in the uranium intermetallic compounds: UCoGa5, U2Ru2Sn and U2RuGa8

Cerium Valence Change in the Solid Solutions Ce(Rh1-xRux)Sn

Review on magnetic and related properties of RTX compounds

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Product

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Cerium Valence Change in the Solid Solutions Ce(Rh_1-xRux)Sn