Single crystal study on UNi0.5Sb2

Bukowski, Z.; Kaczorowski, D.; Stȩpień‐Damm, J.; Badurski, D.; Troć, R.

doi:10.1016/j.intermet.2004.04.039

Cited by 22 publications

(46 citation statements)

References 9 publications

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“…However, the displacement parameters for the Au atoms are almost double than those for the U and Sb atoms. In contrast to UNi 0.5 Sb 2 [5], no superstructure has been detected. …”

Section: Methodsmentioning

confidence: 69%

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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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“…However, the displacement parameters for the Au atoms are almost double than those for the U and Sb atoms. In contrast to UNi 0.5 Sb 2 [5], no superstructure has been detected. …”

Section: Methodsmentioning

confidence: 69%

“…Single crystals were grown by the self-flux method, as described in [5]. The starting elements with 3N -U, 5N -Au and Sb were taken with the appropriate ratio and an excess of a flux was used.…”

Section: Methodsmentioning

confidence: 99%

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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“…Recently, single crystals of this compound have been grown from an Sb flux and systematically studied by means of X-ray diffraction, electron microprobe, magnetic susceptibility, magnetization, electrical resistivity, magnetoresistivity, specific heat and isothermal magnetocaloric effect measurements [5,6]. Unexpectedly, the results of the EDX analysis and the crystal structure refinements indicated significant deficiency on the transition metal sites in the tetragonal HfCuSi 2 -type unit cell, yielding the actual composition UNi 0.5 Sb 2 .…”

Section: Introductionmentioning

confidence: 99%

“…at T N = 161.5 K, and moreover, they exhibit another phase transition near T t = 64 K, which has not previously been observed. As no crystal structure distortion could be detected at 10 K, it was suggested in [5] that the features observed at T t might signal a change in the magnetic structure.…”

Section: Introductionmentioning

confidence: 99%