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TT: Fachverband Tiefe Temperaturen
TT 27: Correlated Electrons: Other Materials
TT 27.4: Talk
Tuesday, March 19, 2024, 10:15–10:30, H 3010
Ferromagnetism in epitaxial Ca1−xSrxIrO3 thin films grown by metal-organic aerosol deposition — •Robert Gruhl, Ludwig Scheuchenpflug, Robin Heumann, and Philipp Gegenwart — Experimentalphysik VI, Universität Augsburg, Germany
SrIrO3 is a paramagnetic semimetal with strong spin-orbit coupling which can give rise to various interesting physical states [1]. The isostructural and isoelectric perovskite phase of CaIrO3 has very similar properties but a significantly smaller unit cell [2]. This enables a tuning of the lattice parameter over a wide range by chemical doping in the form of Ca1−xSrxIrO3.
Suprisingly small amounts of Calcium lead to a ferromagnetic phase in the investigated fully strained thin films as indicated by an emergent anomalous Hall effect. This behaviour is accopanied by an unusual increase in the out-off-plane lattice parameter.
Epitaxial thin films of Sr1−xCaxIrO3 are deposited on STO(001) substrates by metal-organic aerosol deposition, which conveniently allows to grow thin films with varying chemical compositions, since in contrast to PLD no target is required. The structural properties of the samples are investigated by x-ray diffraction and TEM imaging. The electronic and magnetic properties are studied by Hall- and magnetoresistance as well as magnetization mesasurements.
[1] K. Kleindienst et al., Phys. Rev. B 98, 115113 (2018).
[2] A. Biswas et al., J. Appl. Phys. 21, 195305 (2015).
Keywords: Iridate; Thin Films; Ferromagnetism; Anomalous Hall Effect; Chemical Doping