CeNiGe and NdNiGe phase diagrams: systematics of rare earth-nickel-germanium compounds

Salamakha, P.; Konyk, M.; Sologub, O.; Bodak, Ο. I.

doi:10.1016/0925-8388(95)02081-0

Cited by 55 publications

(36 citation statements)

References 2 publications

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“…3 schematically shows the composition where single crystal is grown by a Czochralski pulling method. Although five ternary compounds have been reported in the region of B (Ce 2 NiGe 6 , Ce 3 Ni 2 Ge 7 , CeNiGe 3 , CeNiGe 2 and Ce 2 Ni 3 Ge 5 ) [3], only the single crystal of CeNiGe 2 was grown in this work. A flux-method may be available to obtain other single crystal.…”

Section: Crystal Structurementioning

confidence: 99%

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Single-crystal growth of layered Ce–Ni–Ge ternary compounds

Ohashi

Oomi

Ishida

et al. 2006

Journal of Alloys and Compounds

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Section: Crystal Structurementioning

confidence: 99%

“…Recently Salamakha et al, have identified 20 ternary germanides in the Ce-Ni-Ge system [3]. Durivault et al summarized the physical properties of these ternary germanides in order to determine the influence of chemical composition [4].…”

Section: Introductionmentioning

confidence: 99%

Single-crystal growth of layered Ce–Ni–Ge ternary compounds

Ohashi

Oomi

Ishida

et al. 2006

Journal of Alloys and Compounds

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“…2(a). 6,7 No information is available about its physical properties. Recent measurements of the physical properties of the related compounds RNiGe 3 (R = Y, Ce-Nd, Sm, Gd-Lu) with the same stoichiometry but with a different base-centered orthorhombic SmNiGe 3 -type crystal structure (space group Cmmm) have been reported, and most of these are found to order antiferromagnetically.…”

Section: 5mentioning

confidence: 99%

Antiferromagnetism in EuNiGe3

2013

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The synthesis and crystallographic and physical properties of polycrystalline EuNiGe3 are reported. EuNiGe3 crystallizes in the noncentrosymmetric body-centered tetragonal BaNiSn3-type structure (space group I4mm), in agreement with previous reports, with the Eu atoms at the corners and body center of the unit cell. The physical property data consistently demonstrate that this is a metallic system in which Eu spins S = 7/2 order antiferromagnetically at a temperature TN = 13.6 K. Magnetic susceptibility χ data for T > TN indicate that the Eu atoms have spin 7/2 with g = 2, that the Ni atoms are nonmagnetic, and that the dominant interactions between the Eu spins are ferromagnetic. Thus we propose that EuNiGe3 has a collinear A-type antiferromagnetic structure, with the Eu ordered moments in the ab-plane aligned ferromagnetically and with the moments in adjacent planes along the c-axis aligned antiferromagnetically. A fit of χ(T ≤ TN) by our molecular field theory is consistent with a collinear magnetic structure. Electrical resistivity ρ data from TN to 350 K are fitted by the Bloch-Grüneisen model for electron-phonon scattering, yielding a Debye temperature of 265(2) K. A strong decrease in ρ occurs below TN due to loss of spin-disorder scattering. Heat capacity data at 25 K ≤ T ≤ 300 K are fitted by the Debye model, yielding the same Debye temperature 268(2) K as found from ρ(T ). The extracted magnetic heat capacity is consistent with S = 7/2 and shows that significant short-range dynamical spin correlations occur above TN. The magnetic entropy at TN = 13.6 K is 83% of the expected asymptotic high-T value, with the remainder recovered by 30 K.

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“…Quality of the specimens was checked by means of X-ray powder diffraction and microprobe analysis. The samples selected for resistivity measurements were found to be single phase with the crystal structures as reported in the literature [4]. The electrical resistivity was measured on bar-shaped samples in the temperature range 1.5-300 K using a standard DC four-probe technique with spot-welded contacts strengthened mechanically with silver-epoxy paste.…”

mentioning

confidence: 99%

Kondo effect in the presence of crystal‐field in Ce–Ni–Ge compounds

Pikul

Kaczorowski

Rogl

et al. 2003

Physica Status Solidi (b)

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are typical for simple intermetallics. In turn, the magnetic contributions q mag ðTÞ to the resistivity of the Ce-based phases reveal in the paramagnetic region logarithmic slopes and humps, characteristic of Kondo systems with strong crystal-field interactions, as predicted by the Cornut-Coqblin theory. The total crystal-field splittings of the 2 F 5=2 ground multiplet of Ce 3þ ions were estimated to be of 100-200 K. In the magnetically ordered region the resistivity strongly decreases showing at the lowest temperatures a behavior typical for electron-magnon scattering.The recent discovery of pressure-induced heavy-fermion superconductivity in CeNi 2 Ge 2 [1] has turned attention to other phases forming in the Ce-Ni-Ge system. Previously we reported on the results of AC magnetic susceptibility and specific heat measuremets performed on CeNiGe 3 , Ce 2 Ni 3 Ge 5 , Ce 3 NiGe 2 , and Ce 3 Ni 2 Ge 7 [2,3]. Here, we discuss the magnetic contributions to the electrical resistivity of these compounds.Polycrystalline samples of CeNiGe 3 , Ce 2 Ni 3 Ge 5 , Ce 3 NiGe 2 , Ce 3 Ni 2 Ge 7 , and their nonmagnetic La or Y-based analogues were prepared by arc melting the stoichiometric amounts of the elements under purified argon atmosphere. Next, the pellets were wrapped in thin molybdenum foil, sealed in evacuated quartz tubes and heat-treated in resistance furnaces. All the Ce compounds were annealed at 800 C for 1 week and the La ones at 600 C for 2 weeks. Quality of the specimens was checked by means of X-ray powder diffraction and microprobe analysis. The samples selected for resistivity measurements were found to be single phase with the crystal structures as reported in the literature [4]. The electrical resistivity was measured on bar-shaped samples in the temperature range 1.5-300 K using a standard DC four-probe technique with spot-welded contacts strengthened mechanically with silver-epoxy paste.All the La(Y)-based conpounds were found to exhibit the electrical behavior characteristic of simple nonmagnetic intermetallics. Their qðTÞ curves can be well described using modified Bloch-Grçn-eisen relation

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CeNiGe and NdNiGe phase diagrams: systematics of rare earth-nickel-germanium compounds

Cited by 55 publications

References 2 publications

Single-crystal growth of layered Ce–Ni–Ge ternary compounds

Single-crystal growth of layered Ce–Ni–Ge ternary compounds

Antiferromagnetism in EuNiGe3

Kondo effect in the presence of crystal‐field in Ce–Ni–Ge compounds

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