A new family of heavy-fermion compounds: U4TGa12 (T=Fe, Co, Rh and Pd)

Jardin, R.; Colineau, E.; Griveau, J.‐C.; Boulet, Pascal; Wastin, F.; Rébizant, J.

doi:10.1016/j.jallcom.2006.06.036

Cited by 8 publications

(13 citation statements)

References 34 publications

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“…These latter ones have been clearly identified as small single crystals as in Ref. 4. All analysis ͑powder and single crystals͒ confirm the structure of the material with the U 4 PdGa 12 stoichiometry.…”

Section: Characterization and Experimental Detailssupporting

confidence: 77%

“…This is one remarkable aspect of the recently reported heavyfermion family of compounds An 4 TGa 12 ͑An= U, Np, and Pu; T = Fe, Co, Rh, and Pd͒. 4,5 All the studied compounds revealed an enhanced value of the Sommerfeld coefficient ͑with a maximum of 225 mJ/ Pu mol −1 K −2 in Pu 4 PdGa 12 ͒ but a clear magnetic phase transition occurs only in U 4 PdGa 12 . This material shows antiferromagnetic order evidenced by measurements of magnetization, specific heat, and electrical resistivity.…”

Section: Introductionmentioning

confidence: 69%

“…4 Among these four compounds only U 4 PdGa 12 exhibits magnetic order; therefore we selected this Pd-based compound for further investigations by neutron diffraction, thermopower, high-pressure electrical resistivity, and x-ray diffraction. The crystal structure of U 4 PdGa 12 derives from the well-known AuCu 3 type adopted by UGa 3 .…”

Section: Discussionmentioning

confidence: 99%

“…This material shows antiferromagnetic order evidenced by measurements of magnetization, specific heat, and electrical resistivity. 4 The An 4 TGa 12 compounds crystallize with a body-centered-cubic symmetry corresponding to the Y 4 PdGa 12 structure 6 ͑Fig. 1͒.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic structure and effects of pressure onU4PdGa12

et al. 2009

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We report on the magnetic structure, thermopower, compressibility, and electrical resistivity under pressure of the recently discovered heavy-fermion antiferromagnet U 4 PdGa 12 . The ordering temperature of the annealed polycrystalline U 4 PdGa 12 is T N ϳ 45.5 K. The magnetic structure has been investigated by neutron diffraction. Extra reflections in the powder spectrum appear below ϳ46 K, in good agreement with macroscopic measurements. The simplest magnetic structure compatible with neutron-diffraction data is a collinear antiferromagnetic structure described by the propagation vector q = ͓001͔. In this case the ordered uranium moment amounts to 1.01͑6͒ B and point along the a axis. Thermopower confirms the heavy-fermion features in this uranium intermetallic with positive and high values of Seebeck coefficient. The magnetic transition is clearly identified and induces an upturn below 45.5 K which is followed by a continuous decrease in S͑T͒ at lower temperature. Electrical resistivity measurements of U 4 PdGa 12 under pressure of up to 13.5 GPa indicate the disappearance of the magnetic ordering temperature T N around P c = 10 GPa while compressibility measurements performed by x-ray diffraction up to 25 GPa do not show any structural phase transition related to this magnetic collapse. At higher pressure ͑p Ͼ 10 GPa͒ and at low temperature, a non-Fermi-liquid behavior is observed, with a T 5/3 dependence of the resistivity. This suggests the possible occurrence of a quantum critical point near P c .

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Section: Characterization and Experimental Detailssupporting

confidence: 77%

Section: Introductionmentioning

confidence: 69%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetic structure and effects of pressure onU4PdGa12

et al. 2009

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“…Only five ternary phases belonging to the U-Fe-Ga system have been reported until now: UFeGa 5 [13], UFeGa [14], UFe 6 Ga 6 [15], U 2 FeGa 8 [16], and U 4 FeGa 12 [17]. Recently the first results on the isothermal section of the U-Fe-Ga ternary phase diagram at 800°C were presented, with the identification of four new ternary phases and six extended solubility ranges [18].…”

Section: Introductionmentioning

confidence: 99%

Crystal structure and magnetic properties of UFe5Ga7

Henriques¹,

Mora²,

Cruz³

et al. 2009

Journal of Nuclear Materials

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A New Family of Heavy‐Fermion Compounds: U₄TGa₁₂ (T: Fe, Co, Rh and Pd).

Jardin¹,

Colineau²,

Griveau³

et al. 2007

ChemInform

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A New Family of Heavy-Fermion Compounds: U4TGa12 (T: Fe, Co, Rh and Pd).-The title compounds are prepared by arc melting of stoichiometric mixtures of the constituent elements under argon. The samples are characterized by powder and single crystal XRD, specific heat, resistivity, and magnetization measurements. The U4TGa12 (T: Fe, Co, Rh and Pd) compounds crystallize in the cubic space group Im3m (Y4PdGa12-type structure) with partially ordered occupancy of the Ga octahedra by the transition metal atoms. All compounds display a moderately enhanced value of the Sommerfeld coefficient (80-140 mJ/mol U K 2 ) whereas only U4PdGa12 shows the occurrence of antiferromagnetic order below TN = 43 K. -(JARDIN, R.; COLINEAU, E.; GRIVEAU, J.-C.; BOULET, P.; WASTIN*, F.; REBIZANT, J.; J. Alloys Compd. 432 (2007) 1-2, 39-44; Eur. Comm., Eur. Inst. Transuranium Elem., D-76125 Karlsruhe, Germany; Eng.) -W. Pewestorf 25-024

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A new family of heavy-fermion compounds: U4TGa12 (T=Fe, Co, Rh and Pd)

Cited by 8 publications

References 34 publications

Magnetic structure and effects of pressure onU4PdGa12

Magnetic structure and effects of pressure onU4PdGa12

Crystal structure and magnetic properties of UFe5Ga7

A New Family of Heavy‐Fermion Compounds: U₄TGa₁₂ (T: Fe, Co, Rh and Pd).

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A new family of heavy-fermion compounds: U4TGa12 (T=Fe, Co, Rh and Pd)

Cited by 8 publications

References 34 publications

Magnetic structure and effects of pressure onU4PdGa12

Magnetic structure and effects of pressure onU4PdGa12

Crystal structure and magnetic properties of UFe5Ga7