Münster 1997 – wissenschaftliches Programm
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TT: Tiefe Temperaturen
TT 19: Postersitzung III: Josephsonkontakte(1-25), SQUIDs, Sensoren, Detektoren(26-37), Supraleitung in Hochfrequenz und Elektronik(38-45), Präparation und Dotierung von HTSL(46-53), NMR und Ultraschall in HTSL(54-60), Thermodynamik, Magnetismus(61-68), Transporteigenschaften von HTSL(69-73), Spektroskopie, Ramanstreuung, param. Meissner-Effekt in HTSL(74-84), n-dotierte HTSL(85-91)
TT 19.66: Poster
Donnerstag, 20. März 1997, 15:30–19:00, Z1
Specific heat measurements on a single crystal of Sm214 in high magnetic fields up to 20T — •A. M. Niraimathi, C.T. Lin, A. G. M. Jansen, and E. Gmelin — Max-Planck-Institut für Festkörperforschung, Heisenbergstr. 1, D-70569 Stuttgart Germany
Grenoble High Magnetic Field Laboratory, MPI-FKF and CNRS, BP166, F-38042 Grenoble Cedex 9, France
Heat capapcity measurements were carried out on a single crystal of Sm2CuO4 in high magnetic fields up to 20Tesla, applied both parallel and perpendicular to c-axis. The single crystal was grown in flux method in Pt crucible with excess CuO melt. The crystal is characterised for the composition by electron microprobe analysis (EPMA) and by temperature dependent susceptibilities. Sm ion orders at 5.96K in the absence of magnetic field. The susceptibility measurements in the presence of magnetic field, both parallel and perpendicular to magnetic field suggests the easy axis of magnetisation is parallel to c-axis which is in agreement with that reported in the literature. Up to a field of 7T, there is only a weak dependence on the magnetic field. In a magnetic field of 20T the magnetic ordering shifts to 5.4K with the field being parallel to c-axis and to 5.2K with the field perpendicular to c-axis. The field dependent magnetic anomalies were analysed in view of different magnetic models and the results are compared with that of the magnetic neutron diffraction measurements reported in the literature.1
[1] S. Skanthakumar et al., Phys. Rev. Lett. 68(6), 2228 (1992)