4f-conduction electron hybridization in ternary CeTMAl compounds

Schank, C.; Jährling, F.; Luo, Linjie; Grauel, A.; Wassilew, C.; Borth, R.; Olesch, G.; Bredl, C. D.; Geibel, C.; Steglich, F.

doi:10.1016/0925-8388(94)90234-8

Cited by 57 publications

(53 citation statements)

References 4 publications

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“…Indeed, the 1Ce : 0.85Ru : 1.15 Al sample showed the structure of the hexagonal Laves phase with refined lattice parameters of a = 551.4(2) and c = 871.5(3) pm, V = 0.2294 nm 3 , close to the lattice parameters of a = 550.5 and c = 870.0 pm (the lattice parameter c of 807.0 pm given in that report is most likely a transposed digit) for the 'CeRuAl' sample given in [28]. In contrast, the Guinier powder pattern of the 1Ce : 1.15Ru : 0.85 Al sample revealed only a small amount of the LaNiAltype phase besides mainly RuAl and CeRu 2 .…”

Section: Phase Analyses and Crystal Chemistrymentioning

confidence: 99%

“…The refined lattice parameters of our sample (a = 721. Since we obtained the sample directly via solidification of the melt, and since the annealed sample prepared by Gribanov et al [29] also crystallizes with the same structure type, we suppose that the samples reported to have the structure of the hexagonal Laves phase MgZn 2 [28] …”

Section: Phase Analyses and Crystal Chemistrymentioning

confidence: 99%

“…In first reports [28], this compound was studied by powder diffraction, and the structure of the hexagonal Laves phase with statistical Ru/Al occupancy was assigned. Later on a single crystal study [29] revealed the completely ordered orthorhombic LaNiAl type with short Ce-Ru distances in the range 280 -310 pm, and the authors suggested dimorphism for this equiatomic compound.…”

Section: Introductionmentioning

confidence: 99%

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Unusually Short Ce–Ru Distances in CeRuAl and Related Compounds

Hermes

Matar

Pöttgen

2009

Zeitschrift Für Naturforschung B

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The aluminide CeRuAl with orthorhombic LaNiAl-type structure contains two crystallographically independent cerium sites which both exhibit relatively short Ce-Ru distances, i. e. 280 -302 pm for Ce1 and 286 -310 pm for Ce2. Susceptibility measurements show intermediate valence behavior of the cerium atoms (1.19(1) µ B per formula unit) and no magnetic ordering down to 2 K. Chemical bonding analysis reveals a non-magnetic ground state and strong Ce-Ru bonding. The Ce-Ru bonding peculiarities of CeRuAl are discussed in line with those of other binary and ternary ceriumruthenium compounds.

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Section: Phase Analyses and Crystal Chemistrymentioning

confidence: 99%

Section: Phase Analyses and Crystal Chemistrymentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Unusually Short Ce–Ru Distances in CeRuAl and Related Compounds

Hermes

Matar

Pöttgen

2009

Zeitschrift Für Naturforschung B

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“…For P = 0.29 GPa, a cusp of C(T) at T M2 = 0.75 K resembles that for an isostructural antiferromagnet CePdAl. 10) In the ordered state of CePdAl, one third of the Ce moment remains in a paramagnetic state due to the geometrical frustration in the quasikagome lattice. At P = 1.15 GPa, the large and sharp peak of C at T M2 indicates to a first-order transition.…”

Section: P-t Phase Diagram Of Ybaggementioning

confidence: 99%

Pressure-Induced Magnetic Phase Transitions in Yb-Based Heavy-Fermion Compounds

et al. 2007

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We report a detailed study of the pressure (P)-temperature (T) phase diagrams of two Yb-based heavy-fermion compounds, namely, the antiferromagnet YbAgGe and weak ferromagnet YbRhSb. YbAgGe with a quasikagome lattice of Yb ions undergoes two magnetic phase transitions at T M1 = 0.8 K (second order) and T M2 = 0.65 K (first order). With increasing pressure (P) up to 0.5 GPa, the transitions at T M1 and T M2 merge into one transition. For 0.5 < P < 1.6 GPa, T M2 remains constant and abruptly rises above 1.6 GPa. This rise occurs with a significant change in the specific heat anomaly from a small cusp at T M2 into a large peak at T M3 . This finding suggests that the suppressed magnetic entropy is released due to geometrical frustration at ambient pressure. On the other hand, YbRhSb undergoes a transition into an unusual magnetic state at T M1 = 2.7 K, which is associated with a small spontaneous moment of 3 10 -3 B /Yb. Measurements of the resistivity, specific heat, and ac magnetic susceptibility ac reveal that the application of pressure above 0.9 GPa induces another magnetic transition at T M2 below T M1 . T M2 (P) exhibits a V-shaped minimum of 1.8 K at P C = 1.6 GPa. With increasing pressure up to 2 GPa, the significant enhancement of the peak height of ac suggests that the canted antiferromagnetic state below P C changes to a ferromagnetic state with a large magnetic moment above P C . These complex P-T phase diagrams for YbAgGe and YbRhSb are explained in terms of the competition among distinct types of magnetic interactions, magnetic frustration, and crystal field anisotropy.

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“…In the course of our systematic investigations of such Ce x Ru y X z intermetallics we have obtained single crystals of the hexagonal Laves phase Ce 2 RuAl 3 . Preliminary powder X-ray diffraction data were reported by Schank et al [13] resulting from phase analytical studies of diverse Ce-T -Al systems. This MgZn 2 -type Laves phase has a quite broad homogeneity range CeRu x Al 2−x which approaches closely the equiatomic phase CeRuAl [1,13].…”

Section: Introductionmentioning

confidence: 99%