Single-crystalline study of the ferromagnetic kondo compound UCu0.9Sb2

Bukowski, Z.; Troć, R.; Stȩpień‐Damm, J.; Sulkowski, C.; Tran, V.H.

doi:10.1016/j.jallcom.2005.05.027

Cited by 47 publications

(55 citation statements)

References 12 publications

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“…After passing through their maxima, these two curves decrease almost linearly and by extrapolation they achieve S i = 0 at T = 0 K. In contrary to S (T ), the S ⊥ (T ) curve is positive in the whole temperature range studied. Almost the same overall behavior was found in the case of UCuSb 2 [7], though the latter compound is only a ferromagnet below 113 K. The significant anisotropy in S i (T ) over the whole temperature range studied is likely associated with anisotropic Fermi surface. Considering the similarity in S i (T ) of both Cu-and Au-diantimonides one can suggest that the peak structure in S i (T ) observed in these two compounds is probably of the phonon drag origin, despite the coincidence with T C for the latter compound.…”

Section: Thermopowersupporting

confidence: 65%

Anisotropy of Magnetic and Transport Properties οf UAuSb₂Single Crystals

et al. 2009

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The uranium-gold diantimonide UAuSb2 belongs to a numerous family of ternary compounds crystallizing in a tetragonal structure of the HfCuSi2-type (space group P 4/nmm). In this paper the results of magnetization, electrical resistivity and thermopower measured along the main crystallographic directions are reported. Two magnetic transitions, a ferromagnetic one at TC = 31 K and probably an antiferromagnetic one at TN = 43 K were found. The spontaneous magnetization at 1.9 K amounts about 0.8 µB for B c-axis. Electrical resistivity for j ⊥ c-axis exhibits a T 2 exp(−∆/kT ) dependence at low temperatures and a Kondo effect at higher temperatures above TN. The thermopower S for both main crystallographic directions shows a maximum at the temperature close to TC and the lack of any anomaly at TN.

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Section: Thermopowersupporting

confidence: 65%

Anisotropy of Magnetic and Transport Properties οf UAuSb₂Single Crystals

et al. 2009

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“…The excess of Au is used to avoid the formation of the superconducting binary AuBi 2 as well as to avoid deficiency at the transition metal site, as observed previously in CeAu 0.92 Bi 1.6 single crystals grown with initial stoichiometry 1:1:20 [15]. It is worth noting that vacancies have also been reported in several antimonide single crystals [9][10][11].…”

Section: Methodsmentioning

confidence: 95%

Ferromagnetic Kondo behavior inUAuBi2single crystals

Rosa¹,

Luo²,

Bauer³

et al. 2015

Phys. Rev. B

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We combine magnetization, pressure dependent electrical resistivity, and heat capacity measurements to investigate the physical properties of the novel compound UAuBi2. Our single crystals, grown by the self-flux method, share the same tetragonal HfCuSi2-type structure of their Ce-based counterparts. UAuBi2 shows ferromagnetic ordering at Tc = 22.5 K, in contrast with the antiferromagnetic transition found in CeAuBi2 (TN = 12 K) but closely related to UAuSb2 (Tc = 31 K). Despite the differences, all compounds display an easy-axis of magnetization along the c-axis and a large magnetocrystalline anisotropy. Heat capacity and pressure dependent resistivity suggest that UAuBi2 exhibits moderately heavy fermion behavior (γ ∼ 100 mJ/mol.K 2 ) with strongly localized 5f electrons. An intricate competition between crystalline electric field (CEF) effects and two anisotropic exchange interactions (JRKKY) persists in the 5f system, which leads to the striking difference between ground states. The systematic analysis of our macroscopic data using a mean field model including anisotropic JRKKY interactions and the tetragonal CEF Hamiltonian allows us to extract the CEF scheme and the values of JRKKY. Our results suggest a general trend in this family of compounds and shed light on the similarities and differences between 4f and 5f members.

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“…This is another class of heavy fermion systems, which show very rich behavior, quite different from cerium compounds. It is peculiar of uranium compounds that they exhibit numerous coexistence phenomena, the most prominent of which is the coexistence of magnetic order with Kondo effect [9][10][11][12][13] or the coexistence of the magnetic order with superconductivity. 14,15 We will be primarily interested in the coexistence between ferromagnetic order and Kondo behavior, as, to our knowledge, this effect has been somewhat overlooked from a theoretical point of view.…”

Section: Introductionmentioning

confidence: 99%

Underscreened Kondo lattice model applied to heavy fermion uranium compounds

et al. 2007

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We present theoretical results for the underscreened Kondo lattice model with localized S = 1 spins coupled to a conduction band through a Kondo coupling, J K , and interacting among them ferromagnetically. We use a fermionic representation for the spin operators and expand the Hamiltonian in terms of bosonic fields. For large values of J K , we obtain a ferromagnetically ordered solution and a Kondo regime with a Kondo temperature, T K , larger than the Curie temperature, T C . This finding suggests a scenario for a coexistence of Kondo effect and ferromagnetic order. In some uranium compounds, such as UTe or UCu 0.9 Sb 2 , this kind of coexistence has been experimentally observed: they order ferromagnetically with a Curie temperature of order T C ϳ 100 K and exhibit a Kondo behavior for T Ͼ T C . The proposed underscreened Kondo lattice model accounts well for the coexistence between magnetic order and Kondo behavior and yields to a new "ferromagnetic Doniach diagram."

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Single-crystalline study of the ferromagnetic kondo compound UCu0.9Sb2

Cited by 47 publications

References 12 publications

Anisotropy of Magnetic and Transport Properties οf UAuSb₂Single Crystals

Anisotropy of Magnetic and Transport Properties οf UAuSb₂Single Crystals

Ferromagnetic Kondo behavior inUAuBi2single crystals

Underscreened Kondo lattice model applied to heavy fermion uranium compounds

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Single-crystalline study of the ferromagnetic kondo compound UCu0.9Sb2

Cited by 47 publications

References 12 publications

Anisotropy of Magnetic and Transport Properties οf UAuSb2Single Crystals

Anisotropy of Magnetic and Transport Properties οf UAuSb2Single Crystals

Ferromagnetic Kondo behavior inUAuBi2single crystals

Underscreened Kondo lattice model applied to heavy fermion uranium compounds

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Product

Resources

About

Anisotropy of Magnetic and Transport Properties οf UAuSb₂Single Crystals

Anisotropy of Magnetic and Transport Properties οf UAuSb₂Single Crystals