【摘 要】
：
Low-dimensional oxide structures have remarkable properties that can be tuned by external fields.Particularly,based on the perovskite ABO3(111)surfaces,the so-called double perovskite A2BBO6 structure
【机 构】
：
Beijing National Laboratory for Condensed Matter Physics & Institute of Physics,Chinese Academy of S
【出 处】
：
2015 Shanghai Thin Film Conference(2015上海薄膜国际会议)
论文部分内容阅读
Low-dimensional oxide structures have remarkable properties that can be tuned by external fields.Particularly,based on the perovskite ABO3(111)surfaces,the so-called double perovskite A2BBO6 structure that exhibits exotic behaviors can be realized in the AO3/B/AO3/Bsuperlattice that shows the long-range ordering of the B-site cations along all <100> directions [1,2].The six-fold symmetry possessed by ABO3(1 11)also provides the opportunity to construct novel quantum states [3,4].However,due to the surface polarity of such ionic crystals,it is essentially challenging to realize the high-quality layer-by-layer growth ofABO3(1 11)films or heterostructures.In this talk,by taking SrTiO3(111)surface as an example,I will firstly show that the surface polarity can be compensated by the formation of reconstruction.Therefore the layer-by-layer growth is realized by keeping the surface reconstructed all through the molecular beam epitaxy growth.And the fact that the stability of different reconstruction is determined by the surface cation concentration enables the real time monitoring of the growth rate of Sr and Ti sources.We establish a precise control method and obtain the homoepitaxial layer of SrTiO3(111)on a doped substrate.The film shows an atomically well-defined surface and high dielectric performance,which allows the tuning of carrier concentration in the range of 1013/cm2.On the reconstructed SrTiO3(111)surface,we grow the [111]-oriented(LaMnO3)2/(SrMnO3)1 superlattice by pulsed laser deposition method to achieve the long-range ordering of La and St.Comparing to the La2/3Srv3MnO3(111)fill with identical composition but without the long-rang ordering of the A-site dopants,the superlartice shows significantly enhanced metallicity and ferromagnetism.Possible correlation between the electrical transport and magnetic exchange process is investigated by designing the superlattice with different periodicity.
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