Influence of different substrates on phase separation in La1−x−yPryCaxMnO3 thin films
Influence of different substrates on phase separation in La1−x−yPryCaxMnO3 thin films
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DOI：
10.1063/1.2162050
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发表时间：
2006-04
影响因子：
3.2
通讯作者：
D. Gillaspie;Jianxing Ma;H. Zhai;T. Ward;H. Christen;E. Plummer;Jian Shen
中科院分区：
文献类型：
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作者：
D. Gillaspie;Jianxing Ma;H. Zhai;T. Ward;H. Christen;E. Plummer;Jian Shen
在La1−x−yPryCaxMnO3（LPCMO）晶体和薄膜中，铁磁金属态和电荷有序绝缘态之间的大尺度相分离对结构和磁性变化非常敏感，并且与其母体化合物相比，LPCMO中的磁电阻增强。通过在不同衬底上外延生长LPCMO薄膜，可以改变LPCMO薄膜上的应变，从而控制两相之间的能量平衡。在NdGaO_3（NGO）、SrTiO_3（STO）、SrLaGaO_4（SLGO）和LaAlO_3（LAO）衬底上生长了几种不同厚度的LPCMO薄膜。来自LAO和SLGO衬底的压应变抑制了这些样品中的长程电荷有序化，并增强了磁电阻和磁电阻。相反，来自STO和NGO衬底的拉伸应变增强了长程电荷有序性，并降低了磁阻和磁电阻。
Large scale phase separation between ferromagnetic metallic and charge-ordered insulating states in La1−x−yPryCaxMnO3 (LPCMO) crystals and thin films is very sensitive to structural and magnetic changes and is responsible for the enhanced magnetoresistance in LPCMO compared to its parent compounds. By epitaxially growing LPCMO thin films on different substrates, the strain on the LPCMO thin films can be changed, thereby controlling the energy balance between the two phases. LPCMO films of several different thicknesses have been grown on NdGaO3 (NGO), SrTiO3 (STO), SrLaGaO4 (SLGO), and LaAlO3 (LAO) substrates. The compressive strain from the LAO and SLGO substrates suppresses the long-range charge ordering in these samples and enhances magnetoresistance and magnetic hystereses. Conversely, the tensile strain from the STO and NGO substrates enhances the long-range charge ordering and reduces the magnetoresistance and magnetic hystereses.