Berlin 2005 – wissenschaftliches Programm
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MA: Magnetismus
MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65
MA 20.125: Poster
Montag, 7. März 2005, 14:00–18:00, Poster TU C
Thermodynamic and Transport Properties of the Antiferromagnetic Order in EuZn2Sb2 — •F. Weber1,2, S. Drobnik1,2, K. Grube2, C. Pfleiderer1,2, A. Cosceev1, M. Uhlarz1, H. v. Löhneysen1,2 und A. Nateprov3 — 1Physikalisches Institut, Wolfgang-Gaede Str. 1, D-76128 Karlsruhe, Germany — 2Forschungszentrum Karlsruhe, Institut für Festkörperphysik, D-76021 Karlsruhe, Germany — 3Institute of Applied Physics, Academei 5, MD-2028 Kishinev, Moldova
We report an experimental study of the specific heat, thermal expansion, magnetisation, Hall effect and resisitivty of EuZn2Sb2. Single crystals have been synthesized by means of a solid state reaction using carbon glass crucibles. The crystal structure of EuZn2Sb2 is trigonal, space group P3m1. A second order phase transiton at TN=13.27 K bears all the Hall marks of 3D-XY antiferromagnetic order, where the high field magnetisation and evidence of a spin-flop transition at very low fields are consistent with a weak magnetic anisotropy. Microprobe analysis reveals, however, that the samples are Eu-deficient. Remarkably, the Eu-deficiency may be accounted for purely in terms of two metallurgically segregated phases, where one of the phases is stoichiometric EuZn2Sb2.