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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 CeIn_3−xSn_x — •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 CeIn_3−xSn_x at low temperatures. CeIn₃ orders antiferromagnetically below T_N = 10.2 K. Substituting tin for indium suppresses the magnetic order until T_N = 0 at a critical concentration x_c = 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 CeIn_3−xSn_x, 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)