科研之友
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摘要
High quality Pr0.7Ca0.3MnO3/SrRuO3 superlattices were fabricated by pulsed laser deposition. The SrRuO3 layers grew either in orthorhombic or tetragonal symmetry depending on the thickness of the Pr0.7Ca0.3MnO3 layers. Since the Pr0.7Ca0.3MnO3 layers were insulating at low temperatures, magnetotransport measurements of the superlattices allowed for the measurement of the anomalous and planar Hall effect of the SrRuO3 layers. The easy axis direction was found to be close to the surface normal, [110](o) direction, in the case of orthorhombic SrRuO3, but in plane along < 110 >(t) in the case of tetragonal SrRuO3. The anomalous Hall effect in both the orthorhombic and tetragonal phases can be understood within the intrinsic Berry-phase mechanism. The carrier density was 1.5 and 1.25 electrons per formula unit in the orthorhombic and tetragonal phase, respectively.
- 出版日期2011-9-8
