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TT: Fachverband Tiefe Temperaturen

TT 27: CE: Poster Session

TT 27.23: Poster

Mittwoch, 24. März 2010, 14:00–18:00, Poster D1

Ferromagnetic quantum phase transition in Sr_1−xCa_xRuO₃ thin films — •Melanie Schneider¹, Vasile Moshnyaga¹, Philipp Gegenwart¹, Markus Wissinger², and Dirk Fuchs² — ¹I. Physikalisches Institut, Georg-August Universität Goettingen,Friedrich-Hund-Platz 1, 37077 Goettingen, Germany — ²Karlsruher Institut für Technologie (KIT), Institut für Festkörperphysik, Postfach 3640, 76021 Karlsruhe, Germany

We report results on Sr_1−xCa_xRuO₃ thin films which have been grown epitaxially on SrTiO₃ substrates by metalorganic aerosol deposition. The films are characterized using X-ray diffraction, room-temperature STM, as well as atomic-resolution transmission electron microscopy. The physical properties are investigated by electrical resistivity and magnetization measurements. We observe a continuous suppression of itinerant electron magnetism with T_C=160K for SrRuO₃ with increasing Ca concentration x in Sr_1−xCa_xRuO₃ towards T_C→0 for x_c=0.7. At x>0.7 indications for non-Fermi liquid behavior are found in the low-temperature resistivity. For selected thin films the measurements are extended to mK temperatures. We also report low-temperature electrical resistivity measurements on thin films grown at KIT Karlsruhe by pulsed-laser deposition on various different substrates. Work supported by DFG through SFB 602, TP A19.