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MA: Fachverband Magnetismus

MA 13: Poster Ia: Electron Theory (1); Magnetic Imaging (2,3); Thin Films (4-25); MSMA (26-33); Magn. Semiconductors (34-42); Magn. Half Metals and Oxides (43-60)

MA 13.57: Poster

Dienstag, 24. März 2009, 10:15–13:00, P1A

Elastic properties of single crystal manganites — •Markus Michelmann¹, Dennis Bedorf¹, Emanuel Malek², Thomas Koeppe¹, Lakshmana Sudheendra¹, Vasily Moshnyaga¹, and Konrad Samwer¹ — ¹I. Physikalisches Institut, Universität Göttingen — ²Cambridge University

We have studied the metal-insulator-transition in single crystal perovskite manganites by measurements of velocity of ultrasound waves. The single crystals of La_1−xCa_xMnO₃ (LCMO), Nd_1−xCa_xMnO₃ (NCMO) and Pr_1−xCa_xMnO₃ (PCMO) were grown by zone melting technique. For LCMO the dependence of shear modulus on the temperature (40-280K) and magnetic field (0-5T) was measured by means of runtime of shear waves. The results show, that metal-insulator-transition is accompanied by a decrease of the stiffness, which as well can be driven by the temperature and/or the magnetic field. A comparison with the data of NCMO and PCMO crystals will be done.

Deutsche Forschungsgemeinschaft via SFB 602, TPA2 is acknowledged