Berlin 2015 – wissenschaftliches Programm

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TT: Fachverband Tiefe Temperaturen

TT 23: Magnetic Heuslers, Half-Metals, Semiconductors, and Oxides (organized by MA)

TT 23.9: Vortrag

Montag, 16. März 2015, 17:15–17:30, H 1012

Magnetostriction in pulsed magnetic fields up to 70 T - the spin states in LaCoO₃ — •Mathias Doerr¹, Martin Rotter², Sergey Granovsky¹, Michael Loewenhaupt¹, and Zhaosheng S. Wang³ — ¹TU Dresden, Institut für Festkörperphysik, D-01062 Dresden — ²MPI for Chemical Physics of Solids, D-01187 Dresden — ³FZ Dresden-Rossendorf, Hochfeld-Magnetlabor, D-01314 Dresden

Magnetoelastic investigations in pulsed magnetic fields with a pulse duration of about 10 ms are still challenging. The new optical FBG method overcomes the difficulty of mechanical noise and offers a resolution in the order of 10⁻⁶. As an example, the spin states in LaCoO₃, important for understanding of spin-dependent transport in oxides, were analyzed by longitudinal and transversal magnetostriction measurements up to 70 T. The data show a sharp magnetic transition at about 60 T accompanied by a large volume, but only small distortion effect. Supplemented by electronic energy calculations this confirms a correlated low-to-high spin (LS/HS) transition in contrast to the propagated intermediate spin-state scenario (LS-IS-HS).