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庞磁电阻Pr_0.7Sr_0.3MnO₃/La_0.5Ca_0.5MnO₃/Pr_0.7Sr_0.3MnO₃三层膜的应变分析

The analysis of strain states of giant magnetoresistive Pr_0.7Sr_0.3MnO₃/La_0.5Ca_0.5MnO₃/Pr_0.7Sr_0.3MnO₃ trilayers

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【Author】 WANG Haiou1 LIU Hao1 Dai Ping1 TAN Weishi1 WU Xiaoshan2 JIA Quanjie3 LI Xiaolong4 1(Key Laboratory of Soft Chemistry and Functional Materials,Ministry of Education,Department of Applied Physics,Nanjing University of Science and Technology,Nanjing 210094,China) 2(National Key Laboratory of Solid State Microstructures,Department of Physics,Nanjing University,Nanjing 210093,China) 3(Institute of High Energy Physics,Chinese Academy of Sciences,Beijing 100039,China) 4(Shanghai Institute of Applied Physics,Chinese Academy of Sciences,Shanghai 201800,China)

【机构】南京理工大学理学院应用物理系；南京大学固体微结构物理国家重点实验室南京大学物理系；中国科学院高能物理研究所；中国科学院上海应用物理研究所；

【摘要】用脉冲激光沉积法在MgO(001)衬底上生长了Pr0.7Sr0.3MnO3/La0.5Ca0.5MnO3/Pr0.7Sr0.3MnO3三层膜,其中Pr0.7Sr0.3MnO3的厚度为36nm,La0.5Ca0.5MnO3厚度分别为6、12、18、24、30和36 nm。通过高分辨X射线衍射的对称扫描和非对称扫描测量了三层膜中Pr0.7Sr0.3MnO3和La0.5Ca0.5MnO3的面外、面内晶格参数,研究了薄膜的晶格应变及其弛豫状况。结果表明,La0.5Ca0.5MnO3厚度的增加使薄膜面外应变完全弛豫,但面内的压应变仍然存在。三层膜应变弛豫状态由块材应变和Jahn-Teller应变共同决定。三层膜的应变弛豫机制与四方畸变的应变弛豫机制不同。块材应变和Jahn-Teller应变之间的相互竞争决定了薄膜的磁输运性质。更多还原

【Abstract】 Pr0.7Sr0.3MnO3/La0.5Ca0.5MnO3/Pr0.7Sr0.3MnO3(PSMO/LCMO/PSMO) trilayers were deposited on(001)-oriented single crystal MgO by pulsed laser deposition.The thickness of both PSMO layers was 36 nm while the thickness of LCMO layer was 6,12,18,24,30 and 36nm,respectively.Out-of-plane and in-plane lattice parameters of trilayers were obtained by using symmetric scanning and asymmetric scanning mode of high resolution X-ray diffraction.Strain states of trilayers have been studied.The results showed that strain relaxation states of trilayers were decided by bulk strain and Jahn-Teller(JT) strain together.The mechanism for strain relaxation in trilayers is different from that for tetragonal distortion.The competition between bulk strain and Jahn-Teller(JT) strain played an important role in the magnetotransport and magnetic properties of trilayers.更多还原