用激光分子束外延 ,原子尺度控制的外延生长出多种钙钛矿氧化物异质结 .X射线衍射和原子力显微镜测量结果表明 ,在Si基底上生长的SrTiO3 和LaAlO3 薄膜具有很好的外延结构和取向 ,其表面达到原子尺度的光滑 .YBCO/SrNb0 .0 1 Ti0 .99O3 、La0 .9Sr0 .1 MnO3 /SrNb0 .0 1 Ti0 .99O3(LSMO/SNTO)等异质结 ,均观测到较好的p n结I V特性 .首次观测到钙钛矿结构氧化物p n结电流的磁调制和正巨磁电阻效应 ,在 2 55K条件下 ,当外加磁场分别为 5× 1 0 -4 T、1× 1 0 -3T、1× 1 0 -2 T和 0 .1T时 ,LSMO/SNTOp n结的磁电阻变化率ΔR/R0 达到 :46 .7%、59.7%、70 .5%和 83 .4 % ;当外加磁场为 3T时 ,在 1 0 0K条件下 ,在LSMO/SNTO多层p n异质结上观测 465 %的正磁电阻变化率 . Various types of perovskite oxide heterojunction were grown by laser molecular beam epitaxy and atomic scale control.The results of X-ray diffraction and atomic force microscopy showed that SrTiO3 and LaAlO3 thin films grown on Si substrate have good epitaxial structure And orientations, the surface of which has a smooth atomic scale. The heterojunctions of YBCO / SrNb0. 01 Ti0 .99O3, La0.9Sr0.1MnO3 / SrNb0.0 Ti0.99O3 (LSMO / SNTO) The pn junction IV characteristics of the first observed perovskite structure oxide pn junction current modulation and positive giant magnetoresistance effect at 25K conditions, when the applied magnetic field were 5 × 1 0 -4 T, 1 × 10 The magnetoresistance change rate ΔR / R0 of the LSMO / SNTOp n junction reaches: 46.7%, 59.7%, 70.5% and 83.4% at -3T, 1 × 10-2 T and 0.1T; When the applied magnetic field was 3T, the change rate of positive magnetoresistance of 465% was observed on LSMO / SNTO multi-layer pn heterojunction under the condition of 100K.