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 20.144: Poster

Montag, 7. März 2005, 14:00–18:00, Poster TU C

Canted antiferromagnetism in U_1−xLa_xCu₉Sn₄ — •E.-W. Scheidt¹, U. Killer¹, H. Michor², H.-A. Krug von Nidda³, and W. Scherer¹ — ¹CPM, Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany — ²Institut für Festkörperphysik, TU Wien, 1040 Wien, Austria — ³EKM, Institut für Physik, Universität Augsburg, 86135 Augsburg, Germany

UCu₉Sn₄ crystallizes in the tetragonal space group I4/mcm with the lattice parameters a = 0.86nm and c = 1.236nm. This compound is isotyp to the ferromagnetic systems RECu₉Sn₄ (RE = Ce, Pr, Nd) with Curie-Weiss temperatures of Θ_CW = 5.5K, 10.5K and 15K, respectively. UCu₉Sn₄ exhibits an uncommon magnetic behaviour which is reflected in three different magnetic phase transitions: i) valence shift at 105 K, ii) onset of helimagnetic order at 32 K, and iii) transition into a commensurate antiferromagnetic structure at 22 K with magnetic field induced canting [1]. Here we present specific heat, susceptibility and resistivity studies on La-substituted samples U_1−xLa_xCu₉Sn₄. [1] U. Killer, E.-W. Scheidt, H. Michor, J. Hemberger, H. A. Krug von Nidda and W. Scherer, Physica B, in print.