Berlin 2008 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 32: Correlated Electrons: Poster Session

TT 32.18: Poster

Donnerstag, 28. Februar 2008, 14:00–18:00, Poster B

Preparation of Sr_1−xCa_xRuO₃ thin films — •Melanie Schneider, Vasile Mosneaga, and Philipp Gegenwart — I. Physik. Institut, Georg-August Universitaet Goettingen, Friedrich-Hund Platz 1, 37077 Goettingen

The series Sr_1−xCa_xRuO₃ displays a continuous evolution from itinerant electron magnetism with T_c=160 K (x=0) towards a paramagnetic metallic state at x=1. Previous studies on polycrystalline bulk samples raise the question whether the series shows a quantum critical point [1] or phase separation near x=0.7 [2].
Here, we report first results on thin films which have been grown epitaxially on SrTiO₃ substrates by the metalorganic aerosol deposition technique. This technique is based on the use of a solution containing acetylacetonates of Sr²⁺, Ca²⁺ and Ru³⁺. Growth conditions have been optimized by the variation of the (Sr_1−xCa_x) to Ru ratio, deposition rate, molarity of the solution and deposition temperature. X-ray diffraction as well as STM, electrical resistivity and magnetization measurements are reported.

[1] K. Yoshimura et al., Phys. Rev. Lett. 83, 4397 (1999).

[2] Y.J. Uemura et al., Nature Physics 3, 29 (2007).