La0.33Pr0.34Ca0.33MnO3薄膜的应变效应  

Stress-induced effects in epitaxial La_(0.33)Pr_(0.34)Ca_(0.33)MnO_3 films

作　　者：赵华英[1] 杨欢[1] 马继云[1] 方煦[1] M.Kamran 戴耀民 李明[1] 赵柏儒[1] 邱祥冈[1] 

机构地区：[1]中国科学院物理研究所超导国家重点实验室和北京凝聚态物理实验室,北京100190

出　　处：《物理学报》2008年第11期7168-7172,共5页Acta Physica Sinica

基　　金：国家自然科学基金(批准号10474128,10674168)资助的课题~~

摘　　要：采用脉冲激光沉积法分别在(100)LaAlO3和(100)SrTiO3基片上生长了La0.33Pr0.34Ca0.33MnO3薄膜,并通过磁测量和电输运测量对生长在不同基片上的La0.33Pr0.34Ca0.33MnO3薄膜的物性进行了研究.结果表明,基片和薄膜之间的压应力导致La0.33Pr0.34Ca0.33MnO3薄膜容易出现铁磁相,而电荷有序相则被抑制.基片和薄膜之间的张应力则导致La0.33Pr0.34Ca0.33MnO3薄膜容易出现电荷有序相,铁磁相被抑制.导致该现象的可能原因之一是应力使得晶格中Mn—O键角发生改变而引起双交换作用的改变.La0.33Pr0.34Ca0.33MnO3 thin films have been grown on（100） LaAlO3 and（100） SrTiO3 substrates by pulsed laser deposition,and the physical properties of those thin films have been studied through magnetic and electric transport measurements.The results show that compressive strain between the film and substrate favors the formation of the ferromagnetic metallic phase while suppressing the charge ordered insulating phase.On the contrary,tensile strain tends to enhance the ferromagnetic metallic phase while eliminating the charge ordered insulating phase.The reason could be that the strain induces change in the Mn-O bonding angle in the crystal lattice and thus modify the double exchange interaction.

关 键 词：钙钛矿锰氧化物 相分离 电荷有序 

分 类 号：O484.43[理学—固体物理]