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Unstable Shastry-Sutherland phase in Ce2Pd2Sn
(American Physical Society, 2009-07-01) Sereni, J.G.; Gomez Berisso, M.; Braghta, A.; Schmerber, G.; Kappler, J.P.; Gerencia Física. Departamento Materia Condensada. División Bajas Temperaturas
Thermal (CP), magnetic (M and χac), and transport (ρ) measurements on Ce2Pd2Sn are reported. High-temperature properties are well described by the presence of two excited crystal-field levels at (65±5) K and (230±20) K, with negligible hybridization (Kondo) effects. According to literature, two transitions were observed at TM=4.8 K and TC=2.1 K, respectively. The upper transition cannot be considered as a standard antiferromagnetic because of frustration effects in a triangular network of Ce atoms and the positive sign of the paramagnetic temperature θLTP=4.4 K. The nature of the intermediated phase is described accounting for the formation of ferromagnetic (F) Ce dimers disposed in a quasi-two-dimensional square lattice, resembling a Shastry-Sutherland pattern. According to hysteretic features in ρ(T) and χac(T), the lower F transition is of first order, with CP (T