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首页> 外文期刊>Journal of Superconductivity >Microscopic state of low doped manganites La{sub}(1-x)Sr{sub}xMnO{sub}3 probed by ESR
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Microscopic state of low doped manganites La{sub}(1-x)Sr{sub}xMnO{sub}3 probed by ESR

机译：ESR探测低掺杂锰La {sub}（1-x）Sr {sub} xMnO {sub} 3的微观状态

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摘要

The electron spin resonance (ESR) measurements were performed in single crystals of La{sub}(1-x)Sr{sub}xMnO{sub}3 (0.05 ≤ x ≤ 0.125) in order to study the interplay of crystal field, Dzyaloshinsky-Moriya interaction, Jahn-Teller (JT) effect, and orbital order. The angular dependence of the ESR linewidth of an untwinned La{sub}0.95Sr{sub}0.05MnO{sub}3 single crystal has been analyzed in the high-temperature approximation, which takes into account the microscopic geometry of the four nonequivalent Mn positions in the orthorhombic unit cell. A strong mixing of the |3z{sup}2 - r{sup}2> and |x{sup}2-y{sup}2> states for the real orbital configuration was found. Magnetic inhomogeneities observed in the FSR spectra across the composition range 0.075 ≤ x ≤ 0.125 can be attributed to the presence of ferromagnetic clusters (magnetic spin polarons) in the paramagnetic state. New polaronic models are proposed.
机译：在La {sub}（1-x）Sr {sub} xMnO {sub} 3（0.05≤x≤0.125）单晶中进行电子自旋共振（ESR）测量，以研究晶体场Dzyaloshinsky的相互作用-Moriya相互作用，Jahn-Teller（JT）效应和轨道顺序。在高温近似下，分析了未缠绕的La {sub} 0.95Sr {sub} 0.05MnO {sub} 3单晶的ESR线宽的角度依赖性，其中考虑了四个非等价Mn位置的微观几何形状在正交晶胞中。发现| 3z {sup} 2-r {sup} 2>和| x {sup} 2-y {sup} 2>的强混合是真实的轨道配置。在FSR光谱中，整个成分范围为0.075≤x≤0.125的磁性不均匀性可归因于顺磁性状态下的铁磁团簇（自旋极化子）的存在。提出了新的极化子模型。

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