Abstract
The microstructure and electro-magnetic properties of simultaneous Ba doping for Sr and Co doping for Ru in SrRuO3 have been carefully investigated. All the doped samples exhibit the same orthorhombic Pnma structure as the pure bulk SrRuO3, although introducing some local structural modifications due to the ionic radius mismatch at Sr/Ru-site. A maximum of 2.2% negative magnetoresistance and much suppressed Curie temperature are found for the most insulating Ba and Co co-doped Sr0.88Ba0.12Ru0.88Co0.12O3 sample. The substitution induced A-site disorder, B-site ion dilution, structural distortion and the intrinsic nature of cobalt ion etc. are jointly considered to explain the observed interesting phenomena.
Highlights
Perovskite-based 4d transition metal oxide SrRuO3 (SRO)[1,2,3] has generated significant interests recently
The substitution of Sr by Ba in Sr1-xBaxRuO37 thin film would increase the tetragonal distortion, and the ferromagnetic cure temperature decreased compared with pure SrRuO3 film
In order to get the detailed structural information, Rietveld refinement method has been performed based on the structure of pure SrRuO3, which crystallizes in orthodontic symmetry with space group Pnma
Summary
Perovskite-based 4d transition metal oxide SrRuO3 (SRO)[1,2,3] has generated significant interests recently. The average radius of A-site and the hybridization between B-site cation d-orbital and O 2porbital could be modified by the substitution at A-site or at the B-site This may results in the distortion of RuO6 such as the cation displacement, the deformation in size and cooperative rotation/tilting of octahedron etc., which in turn will play an important role in modulating the macroscopic transport properties. Sarkar et al.[11] adjusted the doping ratio in Sr1-xBaxRu1-xTixO3 (0≤x≤0.8) and a separate chemical phase of dopants is continuously segregated from SRO lattice for samples x≥0.2 It appears that the co-doping method is of considerable interest in other transition metal oxides with regard to tuning the corresponding transport properties, such as in La and Co co-doped BiFeO3,12 La and Mn co-doped (Bi0.90La0.10)(Fe0.95Mn0.05)O3 thin films[4] and La and Ti co-doped BiFeO3 Thin Films,[13] which benefits the improvement in the electrical properties of BiFeO3 thin films. Considering these factors, the whole magnetic and transport properties of SrRuO3 are expected to be modified, which makes the system more attractive
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