标题： 应变驱动的LaCoO3薄膜中的磁性 显示英文标题

标题： Strain driven magnetism in thin films of LaCoO3

摘要： 外延薄膜在LaCoO3(LCO)上的电子结构已在第一性原理电子结构计算中进行了研究。 发现自晶格应变函数变化时会发生自旋态转变，对于非零应变会冻结在中间自旋态。 与早期的猜测相反，这是仅由基底应变引起的，角度变化较小。 中间自旋态还稳定了基态中的铁磁性。 LCO薄膜在LCO上的X射线吸收谱的异常温度依赖性以及在LCO在(LaAlO_{3})_{0.3}(SrAlTaO_{6})_{0.7}\$(LSAT)上的薄膜中缺失的现象也得到了解释。 显示英文摘要

摘要： The electronic structure of epitaxial films on LaCoO3(LCO) has been studied within first principle electronic structure calculations. A spin state transition is found to take place as a function of lattice strain which freezes in the intermediate spin state for non zero strain. In contrast to earlier speculations this is found to arise from substrate strain alone and angle variations are small. The intermediate spin state also stabilizes ferromagnetism in the ground state. The anomalous temperature dependence of the X-ray absorption spectra for films of LCO on LCO and its absence in films of LCO on (LaAlO_{3})_{0.3}(SrAlTaO_{6})_{0.7}$(LSAT) is also explained.