Crystal structure and physical properties of a new intermetallic compound URu2Al10

Troć, R.; Pasturel, Mathieu; Tougait, Olivier; Potel, M.; Noël, H.

doi:10.1016/j.intermet.2011.02.008

Cited by 15 publications

(17 citation statements)

References 41 publications

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“…The magnetic susceptibility shows a broad maximum at 59 K, and between ∼25 and 300 K can be fitted by a phenomenological relation that has been used to describe mixed valency in intermetallic uranium compounds. 38 We have found no indications of long-range magnetic order down to 2 K and we propose that U 2 C 3 is a compound supporting magnetic fluctuations with low excitation energies. Nuclear magnetic resonance measurements of the spin-lattice relaxation rate would be useful to determine directly the characteristic energy scale of the persistent spin fluctuations, as done for instance for the NpPd 5 Al 2 unconventional superconductor.…”

Section: Discussioncontrasting

confidence: 49%

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Evidence for persistent spin fluctuations in uranium sesquicarbide

et al. 2013

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The low-temperature magnetic susceptibility, heat capacity, and electrical resistivity of uranium sesquicarbide have been determined down to 2 K by combining measurements carried out on samples of U 2 C 3 , containing UC as minority phase, and on pure UC specimens. The presence of spin fluctuations with characteristic temperature T SF = 7 K is revealed by a nonanalytic contribution to the specific heat behaving (well below T SF ) as T 3 ln(T /T SF ), and confirmed by a T 2 increase of the electrical resistivity and a 1 − κT 2 decrease of the low-temperature magnetic susceptibility. The analysis of the specific-heat data above T SF provides a Debye temperature D ≈ 256 K and a moderate high value of the Sommerfeld coefficient, γ ≈ 42 mJ mol −1 U K −2 . The zero-temperature many-body enhancement of the electron mass is found to be m * /m ≈ 2.7. Our data rule out the occurrence of magnetic ordering in U 2 C 3 . First-principles electronic structure calculations support the absence of a magnetically ordered ground state but suggest that dynamical spin fluctuations are responsible for the electron mass enhancement.

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Section: Discussioncontrasting

confidence: 49%

“…[36][37][38] In such a model, charge fluctuations would occur between a 5f 3 (J = 9/2) state and a 5f 2 6d 1 nonmagnetic singlet originating from the excited configuration. The susceptibility is given by 38…”

Section: Resultsmentioning

confidence: 99%

Evidence for persistent spin fluctuations in uranium sesquicarbide

et al. 2013

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“…where a and b are field-and temperature-independent parameters depending exclusively on conduction electron properties and ρ(0,T) is the total resistivity at zero field which is given analytically by the Bloch-Grüneisen relation (4). Thus, the solid lines in Figure 7 are the results of a least squares fit of Equation (6) to the magnetoresistivity data.…”

Section: Electrical Resistivity and Magnetoresistivitymentioning

confidence: 99%

“…Thus, a growing interest in the study of these kinds of compounds exists in the literature [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Physical properties of cage-like compound UB₁₂

Troć

Wawryk

Pikul

et al. 2015

Philosophical Magazine

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Boron and uranium form three metallic borides having the chemical formulae UB 2 , UB 4 and UB 12 . In this study, we present the temperature variations of magnetic susceptibility, specific heat, electrical resistivity (performed in magnetic fields of 0 and up to 9 T), thermoelectric power and thermal conductivity measured on the bulk sample of UB 12 . This dodecaboride behaves as a typical metal, being a Pauli paramagnet and exhibiting a large variety of physical properties due to its specific close-packed structure containing B 12 groups. We describe also an uncommon phenomenon observed in UB 12 , that is, a fairly large scattering of the experimental resistivity data under application of a magnetic field at low temperatures and its systematic vanishing during heating of the sample. This effect is probably caused by inharmonious movement (rattling) of the uranium atoms inside the oversized coordination cage, B 24 , reflected by applying the magnetic field. The specific heat, resistivity, thermoelectric power and heat transport data have been analysed in the framework of the low-frequency Einstein modes, which are mainly responsible for the phonon spectra behaviour in the system studied here.

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“…The orthorhombic ternary compound RT 2 Al 10 (R=rear earth elements; T= Fe, Ru, Os) [15] have drawn tremendous interest in the community because they have displayed a lot of intriguing properties [16][17][18]. For example, an unexpected antiferromagnetic phase transition was identified to occur at 27 K in CeRu 2 Al 10 compound [19][20][21], while CeFe 2 Al 10 was reported to be a Kondo insulator [22,23].…”

Section: Introductionmentioning

confidence: 99%

Single-crystal growth and physical property characterization of the intermediate-valence compound YbFe2Al10

Chen

Wang

et al. 2017

Phys. Rev. B

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We report single crystal growth and physical properties characterization of YbFe 2 Al 10 compounds. The measurements of resistivity, magnetic susceptibility, and specific heat show different behaviors from previous studies on polycrystal samples. An intermediate valent characteristic with moderate mass enhancement is indicated. In particular, the optical spectroscopy measurement reveals formation of multiple hybridization energy gaps which become progressively pronounced at low temperature. The multiple hybridization energy gaps are likely caused by the hybridizations between the flat band from Yb 4 f electrons and different bands of conduction electrons.

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Crystal structure and physical properties of a new intermetallic compound URu2Al10

Cited by 15 publications

References 41 publications

Evidence for persistent spin fluctuations in uranium sesquicarbide

Evidence for persistent spin fluctuations in uranium sesquicarbide

Physical properties of cage-like compound UB₁₂

Single-crystal growth and physical property characterization of the intermediate-valence compound YbFe2Al10

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Crystal structure and physical properties of a new intermetallic compound URu2Al10

Cited by 15 publications

References 41 publications

Evidence for persistent spin fluctuations in uranium sesquicarbide

Evidence for persistent spin fluctuations in uranium sesquicarbide

Physical properties of cage-like compound UB12

Single-crystal growth and physical property characterization of the intermediate-valence compound YbFe2Al10

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Product

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Physical properties of cage-like compound UB₁₂