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Short-range magnetic interactions and optical band-edge physics in SrCu_2(BO_3)_2

机译:SrCu_2(BO_3)_2中的短程电磁相互作用和光学带边缘物理学

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摘要

Optical reflectivity spectra of SrCu_2(BO_3)_2 revealed a feature at 1.5 eV assigned as the energy gap for the charge-transfer excitation. Changes in the optical reflectivity induced by temperature and applied magnetic field were compared to population statistics to establish a correlation between the optical changes and magnetic excitations on the dimers. A Curie-like analysis of the optical data demonstrated that the Weiss constant and spin-gap energy obtained from an analysis of the magnetic susceptibility could also be used to describe reflectivity changes at the band edge. Differences between the temperature- and magnetic field-induced changes to the optical data were also identified and interpreted as potentially indicative of a multitriplet or cooperative interaction between dimer spin excitations and band-edge charge carriers.
机译:SrCu_2(BO_3)_2的光反射光谱表明,在1.5 eV处有一个特征被指定为电荷转移激发的能隙。将温度和施加的磁场引起的光反射率变化与总体统计数据进行比较,以建立二聚体上的光学变化和磁激发之间的相关性。光学数据的居里样分析表明,从磁化率分析中获得的魏斯常数和自旋间隙能量也可用于描述谱带边缘的反射率变化。还确定并解释了温度和磁场引起的光学数据变化之间的差异,并潜在地表明了二聚体自旋激发和带边电荷载体之间的多三重态或协同相互作用。

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