Dresden 2011 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 46: Magnetic Thin Films II
MA 46.9: Vortrag
Mittwoch, 16. März 2011, 19:00–19:15, CHE 184
Effect of anisotropic lattice changes on ferromagnetic order in Sr1−xCaxRuO3 — •Markus Wissinger1, Dirk Fuchs1, Levin Dieterle2, Harald Leiste3, Rudolf Schneider1, Dagmar Gerthsen2, and Hilbert v. Löhneysen1,4 — 1Karlsruher Institut für Technologie, Institut für Festkörperphysik, 76021 Karlsruhe, Germany — 2Karlsruher Institut für Technologie, Laboratorium für Elektronenmikroskopie, 76131 Karlsruhe, Germany — 3Karlsruher Institut für Technologie, Institut für Materialforschung, 76131 Karlsruhe, Germany — 4Karlsruher Institut für Technologie, Physikalisches Institut, 76131 Karlsruhe, Germany
Thin films of Sr1−xCaxRuO3 were prepared on (001) oriented SrTiO3 and (La0.3Sr0.7)(Al0.65Ta0.35)O3 single crystal substrates via pulsed laser deposition. The films experience epitaxial strain ranging from compressive to tensile. Increasing compressive strain leads, independently of the Ca content x, to a shrinking unit cell volume. For constant x, compressive (tensile) strained films showed a decrease (increase) of the ferromagnetic Curie temperature, TC, compared to the bulk value. The strain induced reduction of TC was found to be strongly correlated to the decrease of the unit-cell volume VUC, i. e., ∂ TC/∂ VUC ≈ 26.2 KÅ−3, nearly independent of x. Surprisingly, the anisotropic biaxial strain in our films leads to almost the same value of ∂ TC/∂ VUC that has been deduced for bulk SrRuO3 under isotropic hydrostatic pressure.