Regensburg 2007 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 20: Correlated Electrons - Poster Session

TT 20.6: Poster

Mittwoch, 28. März 2007, 14:00–17:45, Poster A

Magnetic order in CeIn_3−xSn_x investigated by µSR measurements — •Julia Arndt¹, Astrid Schneidewind², Oliver Stockert¹, Daniel Andreica³, Nubia Caroca-Canales¹, Christoph Geibel¹, and Michael Loewenhaupt² — ¹MPI f. Chemische Physik fester Stoffe, D-01187 Dresden — ²Inst. f. Festkörperphysik, TU Dresden, D-01062 Dresden — ³Laboratory for Muon Spin Spectroscopy, PSI, CH-5232 Villigen

We report on zero-field muon spin rotation (µSR) measurements on single crystals of the cubic heavy-fermion compound CeIn_3−xSn_x. CeIn₃ orders antiferromagnetically below T_N = 10.2 K. Substituting Sn for In suppresses the magnetic order until T_N = 0 at a critical concentration x_c = 0.67 [1]. For x < 0.2 the specific heat C exhibits the typical λ shaped anomaly at T_N, whereas for x > 0.2 C shows a broad maximum in the vicinity of the phase transition, which is taken as a sign for a change in the magnetic structure [2]. So far it has not been accomplished to detect magnetic intensity by means of neutron scattering in this region [3]. In contrast, µSR with its sensitivity to small local magnetic fields in the sample gives the opportunity to probe if magnetic order is present for x > 0 at all. All CeIn_3−xSn_x samples investigated (x = 0; 0.2; 0.4; 0.55) show a Kubo-Toyabe shaped µSR signal with high depolarisation below T_N and very weak damping above. This is interpreted as the first detection of a clear signature of magnetic order in CeIn_3−xSn_x for x > 0.
T. Rus et al., Physica B, 359-361, 62 (2005); [2] P. Pedrazzini et al., Eur. Phys. J. B, 38, 445 (2004); [3] O.Stockert et al., unpublished