Dresden 2006 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 25: Correlated Electrons - Poster Session
TT 25.74: Poster
Mittwoch, 29. März 2006, 14:30–18:30, P1
Metamagnetic transition in the cubic heavy fermion compound CeIn3−xSnx — •J. Arndt1, N. Caroca-Canales2, M. Dörr1, C. Geibel2, O. Stockert2, and M. Loewenhaupt1 — 1Institut für Festkörperphysik, TU Dresden, D-01062 Dresden — 2Max-Planck-Institut für Chemische Physik fester Stoffe, D-01187 Dresden
We report on magnetisation measurements on single crystals of the heavy fermion alloy CeIn3−xSnx at low temperatures. CeIn3 orders antiferromagnetically below TN = 10.2 K. Substituting tin for indium suppresses the magnetic order until TN = 0 at a critical concentration xc = 0.67 [1]. In the vicinity of this quantum critical point the system shows non-Fermi liquid behaviour [2]. Magnetisation measurements on single crystals with x ≤ 0.8 were performed in static magnetic fields up to B = 13.5 T and pulsed fields up to B = 47 T at temperatures T > 2 K. The susceptibility χ = dM/dB as a function of magnetic field displays a kink at low fields (B < 10 T) in the paramagnetic state of samples with 0.4 ≤ x ≤ 0.65. This anomaly, observed for the first time, seems to be related to a metamagnetic transition where magnetic intersite correlations are destroyed. The critical field B⋆, at which the transition occurs in paramagnetic CeIn3−xSnx, is lowered with increasing x, i. e. with decreasing strength of the correlations in the system. In high magnetic fields (B > 35 T) we observed effects ascribed to the population of the excited crystal field state.
[1] T. Rus et al., Physica B, 359-361, 62 (2005)
[2] J. Custers et al., Acta Phys. Pol. B 34, 379 (2003)