Charge redistribution phenomena at the interfaces of the HTS, insulating and metallic oxides

Interface and low dimensional phenomena are currently a focus of the active and broad scientific investigations. We have fabricated atomically sharp interface structures of the La2-xSrxCuO4 , SrRuO3 , SrTiO3 and LaSrAlO4 by using the atomic layer by layer molecular beam epitaxy MBE, Rf- sputtering and Ion Beam Preferential Etching (IBPE). Based on our structural, transport and inductance studies we discussed possible mechanisms of the surface metallic state in the IBPE SrTiO3 [1], and elevated superconducting temperature observed in the La2-xSrxCuO4 bi-layers [2]. [1] Reagor D.W., Butko V.Y. Highly conductive nanolayers on strontium titanate produced by preferential ion beam etching. Nature Materials 4 (8): 593-596 Aug., 2005. [2] Bozovic I, Logvenov G, Belca I, et al. Epitaxial strain and superconductivity in La2-xSrxCO4 thin films. Physical Review Letters 89 (10) Art. 107001, Sep.2, 2002.