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Regensburg 2000 – scientific programme

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TT: Tiefe Temperaturen

TT 7: Postersitzung I: Amorphe- und Tunnelsysteme (1-8), Mesoskopische Systeme (9-21), Schwere Fermionen (22-32), Kernmagnetismus (33-34), Josephson-Kontakte und SQUIDs (35-45), TT-Detektoren und Kryotechnik (46-49)

TT 7.29: Poster

Monday, March 27, 2000, 14:30–18:00, A

High-resolution magnetization studies of the heavy-fermion superconductor CeCu2Si2 at very low temperatures and high magnetic fields. — •T. Tayama1, T. Lühmann1, M. Lang1, F. Steglich1, and W. Aßmus21Max-Planck Institut für Chemische Pysik fester Stoffe, Nöthnitzer Str. 48, 01187 Dresden — 2Institut für Physik, SFB 252, Universität Frankfurt, 60325 Frankfurt

A Faraday force magnetometer has been developed for static magnetization measurements at very low temperatures down to 50 mK and in magnetic fields up to 14 T. It consists of a plate capacitor with one movable plate placed in a magnetic field with well-defined field gradient. This device enabled us to perform high-resolution (10−7 emu) measurements of the static magnetization of the heavy-fermion superconductor CeCu2Si2 as a function of both field and temperature.
One of the most interesting problems of this compound is the complicated B-T phase diagram, which shows the superconducting phase at about 0.7 K in addition to two phases A and B whose origin is still under discussion. The temperature dependence of the magnetization is found to show a small but appreciable cusp when entering phase A/B from the paramagnetic high-temperature phase, consistent with an antiferromagnetically ordered state below TA/B. Besides the B-T phase diagram we also discuss the behaviour of the magnetization in the paramagnetic state, where in various CeCu2Si2 single crystals distinct non-fermi-liquid phenomena were observed both in resistivity and specific-heat.

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