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Puzzling Magnetism of Gd_3Cu_4Sn_4

100%
Łątka K., Pacyna A., Pöttgen R., Schappacher F.
Acta Physica Polonica A
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2008
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vol. 114
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issue 6
1501-1508
EN
A polycrystalline, single phase sample of Gd_3Cu_4Sn_4 (Gd_3Cu_4Ge_4 type, Immm, a = 1473.5(1), b = 694.1(1), c = 447.2(1) pm) was synthesized by arc-melting of the elements and subsequent annealing of the sample at 1220 and 970 K, respectively. The magnetic properties of this compound were studied thoroughly by AC and DC magnetic susceptibility measurements and ^{155}Gd Mössbauer spectroscopy. These results reveal two antiferromagnetic phase transitions close to 13 and 8.6 K, respectively. The thermal variation of the magnetic hyperfine fields observed at two inequivalent Gd sites point to two magnetic substructures, which order independently.
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Magnetic and Thermodynamic Properties of Ce₄RuAl

88%
Debnath J., Strydom A., Sondezi B., Tappe F., Pöttgen R.
Acta Physica Polonica A
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2015
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vol. 127
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issue 2
237-239
EN
The results of magnetic susceptibility and heat capacity measurements are reported for the Ce₄RuAl compound above room temperature to low temperature range (400 K to 0.34 K) and in the magnetic field up to 7 T. The magnetic susceptibility χ(T) exhibits a distinct anomaly at 0.95 K which most probably suggests a paramagnetic to antiferromagnetic phase transition. The magnetic susceptibility obeys the Curie-Weiss law in the region 100-400 K and revealed an effective magnetic moment μ_{eff}=2.18 μ_{B}/Ce which is less than the value for free Ce³⁺ (μ_{eff}=2.54 μ_{B}). The paramagnetic Weiss temperature indicates net antiferromagnetic correlations. In the specific heat a peak at 1.3 K supports the bulk nature of the phase transition observed in χ(T). The Sommerfield coefficient is moderately enhanced in the paramagnetic phase, and suggests f-c correlations among the electrons prior to magnetic ordering. The obtained Sommerfield coefficient γ behavior is consistent with the Anderson model-based theoretical predictions.
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