Berlin 2005 – wissenschaftliches Programm
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MA: Magnetismus
MA 20: Poster:Schichten(1-29),Spintrsp(30-45),Ex-Bias(46-63),Spindyn(64-75),Mikromat.(76-80),Cluster(81-94),Abbv.(95-99),Obflm(100-02),SpElek.(103-09),E-Theo(110-14),Mikromag.(115-16),Spin+PÜ(117-26),Mag.Mat.(127-51),Meth.(152-55),Mol.Mag(156-59),Kondo(160-65
MA 20.4: Poster
Montag, 7. März 2005, 14:00–18:00, Poster TU C
Anisotropic Current-Voltage Characteristics of Strained Sr2CrWO6 Thin Films — •Andrea Boger, Petra Majewski, Stephan Geprägs, Andreas Erb, Matthias Opel, Lambert Alff, and Rudolf Gross — Walther-Meißner-Institut, Bayerische Akademie der Wissenschaften, Walther-Meißner-Str. 8, 85748 Garching
It was predicted that the electrical conductivity of the ferromagnetic double perovskite Sr2FeMoO6 (space group 4I/mmm, TC ≈ 420 K) is intrinsically two-dimensional due to the symmetry of the involved oxygen orbitals and can be varied by pressure [1]. The related material Sr2CrWO6 (Fm3m, TC ≈ 460 K) has similar electronic structure. We have prepared coherently strained thin films of Sr2CrWO6 in an UHV-system by pulsed laser deposition (PLD). Due to the small but finite lattice mismatch to the substrate (SrTiO3) the films grow in 4I/mmm-symmetry. The electrical transport properties of Sr2CrWO6 can be studied by introducing a thin, insulating NdGaO3 buffer layer between the substrate and the double perovskite. High-resolution four circle X-ray diffractometry shows a FWHM below 0.04∘ for the rocking curves of the (004)-film peaks. Electrical transport measurements were performed in and out of plane from 25 K to 300 K. We detect a strong anisotropic behavior in the current-voltage characteristics (IVC): while the in-plane IVCs are ohmic over the whole temperature range, the c-axis transport shows a pronounced non-linear behavior.
This work is supported by the BMBF via grant no. 13N8279.
[1] P. Petrone et al., Phys. Rev. B 66, 104418 (2002).