Influence of crystal field excitations on thermal and electrical resistivity of normal rare‐earth metals

Durczewski, K.; Gajek, Z.; Mucha, J.

doi:10.1002/pssb.201451231

Cited by 3 publications

(1 citation statement)

References 29 publications

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“…In the following we ignore the anisotropy and focus instead on the main features of the experimental curve averaged over the a and c directions. For the compound under study whose magnetic and thermal properties imply the nearly localized picture of the 5f electrons [15], the s-f interaction [43,44], as appearing in the lowest-order Born approximation, is the first candidate to elucidate the increase in resistivity with temperature up to the broad maximum at 150-200 K. It is expressed as:…”

Section: Accepted Manuscriptmentioning

confidence: 99%

Comparative studies of the cage systems ThFe2Al10 and UFe2Al10

Troć

Wawryk

Gajek

et al. 2017

Journal of Alloys and Compounds

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We have grown single crystals of ThFe 2 Al 10 and used them for the refinement of its crystal structure. From the specific heat data, we determined the phonon components, that is, the Debye and Einstein modes, for Th-and Ubased isostructural aluminides. To approximate the Sommerfeld coefficients, we had to include the T 3 lnT term characteristic of spin-fluctuations originating from the Fe-sublattice. The roughly estimated spin-fluctuation temperature is about 11 K. ThFe 2 Al 10 is a weakly temperature-dependent Pauli-paramagnet. However, at lower temperatures the ferromagnetic correlations are observed, which signals that the system drives to quantum criticality. The distinct minimum in electrical resistivity observed at about 20 K suggests a realization of a nonmagnetic two-channel Kondo-effect in ThFe 2 Al 10 , as discussed for ThAsSe [Phys. Rev. Lett. 94, 236603 (2005)], for example. The [ρ(T) -ρ min ] versus T curves of ThFe 2 Al 10 , determined along the a-and c-axes, were used to subtract the phonon contributions from the corresponding ρ(T) a,c of UFe 2 Al 10 . The resulting magnetic part of the average ρ m (T) av curve was then analysed in terms of the influence of the crystal field effect on the transport properties. However, to obtain agreement with the experiment, we had to take into account another effect, namely the Kondo-like one. This kind of probe has been applied for the first time in the case of uranium compounds. Based on the magnetoresistivity, we have revealed the anisotropic low-frequency vibrations of the Th atom (located in its [Al 16 Fe 4 ] cage) interacting with the conduction band, the phenomenon revealed previously in the metallic UB 12 [Phil. Mag. B 95, 2343]. Furthermore, fully relativistic band structure calculations performed for ThFe 2 Al 10 revealed its metallic-like character with a similarly large contribution of the Fe 3d electrons at the Fermi level as predicted previously for its 5f-electron analogue UFe 2 Al 10 . In addition, there are substantial differences between their Fermi surfaces.

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Section: Accepted Manuscriptmentioning

confidence: 99%

Comparative studies of the cage systems ThFe2Al10 and UFe2Al10

Troć

Wawryk

Gajek

et al. 2017

Journal of Alloys and Compounds

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Magnetism and magnetotransport of cage-type compound UOs2Al10

Troć¹,

Gajek²,

Pasturel³

et al. 2019

Intermetallics

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Influence of electron–phonon interaction and crystal field on thermal and electrical resistivity in rare earth intermetallics

2020

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The thermal and electrical resistivity of f-electron cubic intermetallic metals with well localized and stable stable f-shells are calculated as functions of the temperature. The interaction of the conduction electron with both acoustic and optical phonons as well as the exchange s–f interaction with the crystal field presence are taken into account by applying the Matthiessen rule on the microscopic level and simple well-founded models of the scattering with the same mathematical method within the Boltzmann equation approach. Derived analytical formulas are successfully used to model existing measurements of temperature dependence of electric and thermal conductivity for DyIn3 and TmIn3 in the paramagnetic phase. Attention was drawn to the possible indeterminacy of some material constants in the absence of indications from sources other than transport measurements, noticeable in our results for TmIn3. Graphical abstract

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Influence of crystal field excitations on thermal and electrical resistivity of normal rare‐earth metals

Cited by 3 publications

References 29 publications

Comparative studies of the cage systems ThFe2Al10 and UFe2Al10

Comparative studies of the cage systems ThFe2Al10 and UFe2Al10

Magnetism and magnetotransport of cage-type compound UOs2Al10

Influence of electron–phonon interaction and crystal field on thermal and electrical resistivity in rare earth intermetallics

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