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Film Thickness Dependence of Rectifying Properties of La1.85Sr0.15CuO4/Nb-SrTiO3 Junctions 下载免费PDF全文
In this work, p-n junctions are made from directly depositing optimal doped La1.85Sr0.15CuO4 (LSCO) films on n-type Nb-doped SrTiO3 substrates. Film thickness controlled rectifying behaviors are strikingly displayed. The starting points of the diffusion voltage reduction Vd-on change clearly with varying film thickness. Vd-on and Tc coincide with each other when the film thickness is larger than 300 nm, indicating a close relation between the two parameters. However, when the film is very thin (〈 350 nm) a departure between the two parameters was also observed. A possible reason for this is discussed within the framework of an inhomogeneous Sehottky contact. Enhanced interface inhomogeneity due to the tensile strain appears to be the origin. 相似文献
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Enhancing low-field magnetoresistance of La0.67Ca0.33MnO3 films deposited on anodized aluminium-oxide membranes 下载免费PDF全文
In this paper we report a new method to fabricate nanostructured films, La0.67Ca0.33MnO3 (LCMO) nanostructured films have been fabricated by using pulsed electron beam deposition (PED) on anodized aluminium oxide (AAO) membranes, The magnetic and electronic transport properties are investigated by using the Quantum Design physics properties measurement system (PPMS) and magnetic properties measurement system (MPMS). The resistance peak temperature (Tp) is about 85 K and the Curie temperature (To) is about 250 K for the LCMO film on an AAO membrane with a pore diameter of 20nm. Large magnetoresistance ratio (MR) is observed near Tp. The MR is as high as 85% under 1 T magnetic field. The great enhancement of MR at low magnetic fields could be attributed to the lattice distortion and the grain boundary that are induced by the nanopores on the AAO membrane. 相似文献
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Ordered YBa2Cu3Oy nanowires have been fabricated by filling YBa2Cu3Oy melting liquid into the pores of the anodized alumina templates. X-ray powder diffraction proves that YBa2Cu3Oy nanowires crystallized in the Y-123 structure. The temperature dependence of ac susceptibility indicates a superconducting transition at 91 K for the YBa2Cu3Oy nanowire array. 相似文献
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采用脉冲电子束沉积(PED)技术在Si(100)衬底上生长La_Sr_Cu_O薄膜,在750℃生长温度下获得具有有序纳米结构的表面形貌.采用聚集离子束(FIB)技术对获得的纳米结构进行表征,结果表明,这种有序的纳米结构是由于Si衬底和La_Sr_Cu_O薄膜之间的热膨胀系数和晶格的 失配引起的纳米裂纹.在这些纳米裂纹处,La_Sr_Cu_O成核生长获得独立的纳米线.通过控制 这种有序的纳米结构的生长,这种有序的纳米结构可以用来构造弱连接形成的器件.
关键词:
脉冲电子束沉积
La_Sr_Cu_O薄膜
纳米结构 相似文献
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