Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 63: Poster II (Surface Magnetism/ Magnetic Imaging/ Topological Insulators/ Spin Structures and Magnetic Phase Transitions/ Graphene/ Magnetic Thin Films/ Magnetic Semiconductors/ Magnetic Half-metals and Oxides/ Spin-dependent Transport/ Spin Excitations and Spin Torque/ Spin Injection and Spin Currents in Heterostructures/ Spintronics/ Magnetic Storage and Applications)
MA 63.17: Poster
Freitag, 18. März 2011, 11:00–14:00, P2
Magneto-acoustic study of single crystalline UCu0.95Ge — •S. Yasin1, A.V. Andreev2, Y. Skourski1, J. Wosnitza1,3, S. Zherlitsyn1, and A.A. Zvyagin3,4 — 1Hochfeld-Magnetlabor Dresden (HLD), Forschungszentrum Dresden-Rossendorf, 01314 Dresden, Germany — 2Institute of Physics ASCR, Na Slovance 2, 18221 Prague 8, The Czech Republic — 3Institut für Festkörperphysik, Technische Universität Dresden, 01069 Dresden, Germany — 4B.I. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine, Kharkov, 61103, Ukraine
We present results of a magneto-acoustic study on a UCu0.95Ge single crystal. This compound exhibits antiferromagnetic ordering at 48 K and shows a first-order metamagnetic phase transition at 38 T to a spin-polarized state, i.e., when the magnetic field is applied along the c direction a sharp jump in the magnetization appears. The sound velocity and sound attenuation demonstrate pronounced anomalies in the vicinity of both magnetic phase transitions proving the important role of magneto-elastic interactions in the physics of this actinide compound. Above TN, the acoustic characteristics show some unusual frequency-dependent features which presumably can be related to the dynamics of Cu vacancies in UCu0.95Ge. Our results are discussed in frame of a phenomenological model, which describes qualitatively the main experimental observations.