Ferromagnetic Kondo behavior in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi mathvariant="normal">UAuBi</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:math>single crystals

Rosa, P. F. S.; Luo, Yongkang; Bauer, E. D.; Thompson, J. D.; Pagliuso, P. G.; Fisk, Z.

doi:10.1103/physrevb.92.104425

Cited by 10 publications

(8 citation statements)

References 30 publications

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“…Nevertheless removing the Au vacancies of CeAu 0.92 Bi 1.6 leads to a higher B 0 2 parameter and a higher T N . This result reinforces the general trend observed in the 112 family of materials, in which larger values of B 0 2 favor higher transition temperatures, as observed in CeAu 0.92 Bi 1.6 [11], CeCuBi 2 [14], CeNi 1−x Bi 2 [22], CeCd 1−δ Sb 2 [23] and UAuBi 2 [24].…”

Section: Resultssupporting

confidence: 89%

Electronic and magnetic properties of stoichiometric CeAuBi2

et al. 2020

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We report the electronic and magnetic properties of stoichiometric CeAuBi2 single crystals. At ambient pressure, CeAuBi2 orders antiferromagnetically below a Néel temperature (TN) of 19 K. Neutron diffraction experiments revealed an antiferromagnetic propagation vectorτ = [0, 0, 1/2], which doubles the paramagnetic unit cell along the c-axis. At low temperatures several metamagnetic transitions are induced by the application of fields parallel to the c-axis, suggesting that the magnetic structure of CeAuBi2 changes as a function of field. At low temperatures, a linear positive magnetoresistance may indicate the presence of band crossings near the Fermi level. Finally, the application of external pressure favors the antiferromagnetic state, indicating that the 4f electrons become more localized.

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Section: Resultssupporting

confidence: 89%

Electronic and magnetic properties of stoichiometric CeAuBi2

et al. 2020

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“…Among the actinide ferromagnets analyzed in this paper, the Kondo-like logarithmic temperature dependence of the resistivity (ρ ∼ -lnT ) has been reported in UCo 0.5 Sb 2 (T C /T 0 = 0.240) [171], UPS(0.260) [124], UAuBi 2 (0.407) [129], UCu 0.9 Sb 2 (0.448) [127],…”

Section: Discussionmentioning

confidence: 83%

Itinerant ferromagnetism in actinide 5f -electron systems: Phenomenological analysis with spin fluctuation theory

et al. 2017

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We have carried out an analysis of magnetic data in 69 uranium, 7 neptunium and 4 plutonium ferromagnets with the spin fluctuation theory developed by Takahashi (Y. Takahashi, J. Phys. Soc. Jpn. 55, 3553 (1986)). The basic and spin fluctuation parameters of the actinide ferromagnets are determined and the applicability of the spin fluctuation theory to actinide 5f system has been discussed. Itinerant ferromagnets of the 3d transition metals and their intermetallics follow a generalized Rhodes-Wohlfarth relation between p eff /ps and TC/T0, viz., p eff /ps ∝ (TC/T0) −3/2 . Here, ps, p eff , TC, and T0 are the spontaneous and effective magnetic moments, the Curie temperature and the width of spin fluctuation spectrum in energy space, respectively. The same relation is satisfied for TC/T0 < 1.0 in the actinide ferromagnets. However, the relation is not satisfied in a few ferromagnets with TC/T0 ∼ 1.0 that corresponds to local moment system in the spin fluctuation theory. The deviation from the theoretical relation may be due to several other effects not included in the spin fluctuation theory such as the crystalline electric field effect on the 5f electrons from ligand atoms. The value of the spontaneous magnetic moment ps increases linearly as a function of TC/T0 in the uranium and neptunium ferromagnets below (TC/T0) kink = 0.32 ± 0.02 where a kink structure appears in relation between the two quantities. ps increases more weakly above (TC/T0) kink . A possible interpretation with the TC/T0-dependence of ps is given.PACS numbers: * Phys. Rev. B. 96, 035125 (2017). † Electronic address: tateiwa.naoyuki@jaea.go.jp and conduction states. In actinide metallic compounds, the degree of localization of the 5f electrons differs in different compounds, ranging from strongly localized to itinerant character. The 3d electrons in transition metals also show various degree of localization. Differences between the 5f and 3d electrons are the smaller sensitivity to the crystal field (CF) from ligand atoms and the stronger spin-orbit coupling in the 5f s. The interplay of the spin and the unquenched orbital degrees of freedom gives rise to the peculiar features of the observed physical phenomena in actinide compounds.While many theoretical studies have been done for the role of the 5f electrons on their interesting physical properties [1][2][3], the behavior of the 5f electrons has not been fully elucidated yet. When the 5f electrons have strongly localized character at higher temperature, a Kondo-lattice picture may be appropriate for understanding the formation of the strongly correlated electric states at low temperatures as has been established in the 4f electrons system of the rare-earth cerium (Ce) and ytterbium (Yb) compounds [5][6][7]. Certainly, some actinide compounds show behaviors reminiscent of the Kondo effect such as the logarithmic temperature dependence of the electrical resistivity (ρ ∼ -lnT ). But not all physical properties in actinide compounds have been consis-

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“…Unfortunately, such reference data are not available yet. Thus, we have attempted to overcome the difficulty by applying two procedures: by fitting the high-temperature data to the theoretical function and by invoking the specific heat of isostructural compound ThAuBi 2 [12]. In the first procedure, we involved two theoretical models for the description of lattice specific heat.…”

Section: Resultsmentioning

confidence: 99%

“…)/ maximum suggests that atomic disorder has negligible effect on specific heat. In fact, the specific heat data in the paramagnetic state can be modeled by the Debye function: In the second procedure used by us we included the specific heat of ThAuBi 2 , which was previously employed as the phonon contribution to specific heat of UAuBi 2 [12]. Following the relationship between Debye temperature and molar mass m of compound, Θ ∼ m 1 D / , we may accomplish C ph for UCu 0.9 Sb 2 from C p of ThAuBi 2 in the following way.…”

Section: Resultsmentioning

confidence: 99%