Puzzling Magnetism of Gd3Cu4Sn4
K. Łątka a, A.W. Pacyna b, R. Pöttgen c, and F.M. Schappacher c
a M. Smoluchowski Institute of Physics, Jagiellonian University, Reymonta 4, 30-059 Kraków, Poland
b H. Niewodniczański Institute of Nuclear Physics, Polish Academy of Sciences, Radzikowskiego 152, 31-342 Kraków, Poland
c Institut für Anorganische und Analytische Chemie, Universität Münster, Corrensstrasse 30, 48149 Münster, Germany
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Received: 08 06 2008
A polycrystalline, single phase sample of Gd3Cu4Sn4 (Gd3Cu4Ge4 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 155Gd 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.
DOI: 10.12693/APhysPolA.114.1501
PACS numbers: 76.80.+y, 75.30.-m