Regensburg 2010 – wissenschaftliches Programm
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TT: Fachverband Tiefe Temperaturen
TT 27: CE: Poster Session
TT 27.68: Poster
Mittwoch, 24. März 2010, 14:00–18:00, Poster D1
Magnetic properties of epitaxially strained Sr1−xCaxRuO3 thin films — •Markus Wissinger, Dirk Fuchs, and Hilbert v. Löhneysen — Institut für Festkörperphysik, Karlsruhe Institute of Technology, Karlsruhe, Germany
The magnetic properties of epitaxially strained Sr1−xCaxRuO3 thin films were investigated with respect to lattice changes caused by i) chemical pressure due to the substitution by smaller Ca ions as well as by ii) epitaxial strain due to the growth on different lattice matched substrate materials.
Stoichiometric polycrystalline targets were produced via standard solid state reaction for 0 ≤ x ≤ 1. Thin epitaxial films were deposited from the targets by pulsed laser deposition on various substrate materials. The structural and magnetic properties of the bulk and thin film samples were characterized by x-ray diffraction and superconducting quantum interference device magnetometry.
The lattice parameters a, b, and c of the bulk as well as the out-of-plane lattice parameter of the thin film samples were found to decrease with increasing Ca substitution. The Curie temperature Tc also decreases with increasing x. Tensile or compressive strain in epitaxial films results in a significant increase or decrease of Tc , respectively, in comparison to the bulk value. The critical concentration, xc, where Tc=0 therefore shifts to higher or lower concentrations with respect to the bulk where xc amounts to 0.7. The sensitivity of Tc to chemical pressure and epitaxial strain will be compared and discussed in detail.