Berlin 2018 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 5: Heusler compounds, semimetals and oxides (joint session MA/TT)
MA 5.12: Vortrag
Montag, 12. März 2018, 12:30–12:45, EB 301
Magnetic shape-memory effect in SrRuO3 — •Daniel Brüning1, Stefan Kunkemöller1, Agung Nugroho2, Isabelle Stunault3, Markus Braden1, and Thomas Lorenz1 — 1II. Physikalisches Institut, Universität zu Köln, Germany — 2Faculty of Mathematics and Natural Science, Institut Teknologi Bandung, Indonesia — 3Institut Laue Langevin, Grenoble, France
As most perovskites, SrRuO3 exhibits structural phase transitions associated with rotations of the RuO6 octahedra. From a high temperature cubic phase it becomes tetragonal at 975 K and orthorhombic at 800 K resulting in six possible domains. Furthermore, SrRuO3 orders ferromagnetically at Tc = 160 K with easy axis anisotropy due to spin orbit coupling. Our neutron diffraction and macroscopic measurements unambiguously show that magnetic fields rearrange structural domains, although the ferromagnetic order occurs at six times lower temperature than the structural distortion. For the field along a cubic [110]c direction, a fully detwinned crystal is obtained. Subsequent heating above Tc causes a magnetic shape-memory effect, where the initial structural domains recover, which is similar to Heusler alloys.
Kunkemöller et al., arXiv:1709.05688 (2017)
Funded by the DFG via CRC 1238 Projects A02, B01, and B04.