4-7 June 2019
Arabella Brauneck Hotel
Europe/Berlin timezone
Abstract submission and registration open until Wednesday, 29th May.

Fabrication and characterization of SrCoO$_{3−\delta}$ thin films

6 Jun 2019, 17:30
1h 30m
Arabella Brauneck Hotel

Arabella Brauneck Hotel

Münchner Str. 25 83661 Lenggries

Speaker

Sabine Pütter (Jülich Centre for Neutron Science JCNS, Outstation at MLZ, Forschungszentrum Jülich GmbH)

Description

Because of its multivalent Co states and high oxygen mobility SrCoO$_{3-\delta}$ (SCO) is a promising material for energy and spintronic applications [1]. Upon changing its oxygen content it exhibits a topotactic phase transition. While SrCoO$_3$ is a ferromagnetic metal (T$_C$=305 K) with perovskite structure,
SrCoO$_{2.5}$ is an antiferromagnetic insulator(T$_N$ =570 K) with brownmillerite structure.
In this contribution, we focus on the fabrication of SrCoO$_{2.5}$ thin films by molecular beam epitaxy on various substrates like SrTiO$_3$ and LaAlO$_3$. As Sr and Co are coevaporated from distinct effusion cells, the first task is to obtain stoichiometric thin films. We present results of RHEED assisted stoichiometric thin film growth and of driving the topotactic transition by annealing in low oxygen gas flow.
For bulk SCO it has been shown that the perovskite structure can be stabilized by adding of about 5 % rare earth ions [2]. For this reason we study the effect of Sm doping on the crystal structure of SCO thin films. The magnetic properties were studied with SQUID and the crystalline properties by surface characterization methods like LEED, RHEED and XRR.

[1] H. Jeen et al., Nature Materials 12, (2013) 1057
[2] M. James et al., Solid State Sciences 6 (2004) 655

Primary authors

Patrick Schöffmann (Jülich Centre for Neutron Science (JCNS) at Heinz Maier-Leibnitz Zentrum (MLZ), Forschungszentrum Jülich GmbH) Sabine Pütter (Jülich Centre for Neutron Science JCNS, Outstation at MLZ, Forschungszentrum Jülich GmbH) Dr Jürgen Schubert (Forschungszentrum Jülich GmbH, Peter Grünberg Institut and JARA- FIT) Katja Palmen (Forschungszentrum Jülich GmbH, Jülich Centre for Neutron Science, Peter Grünberg Institut and JARA-FIT) Thomas Brückel (Forschungszentrum Jülich GmbH)

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