高压下铬尖晶石CdCr $_2$ O $_4$、HgCr $_2$ S $_4$和ZnCr $_2$ Se $_4$光学性质的演变
Evolution of optical properties of chromium spinels CdCr$_2$O$_4$, HgCr$_2$S$_4$, and ZnCr$_2$Se$_4$ under high pressure
摘要：
本文报道了ZnCr $_2$ Se $_4$、HgCr $_2$ S $_4$和CdCr $_2$ O $_4$单晶在室温下200-24000 cm $^{-1}$宽光谱范围内的压力依赖反射和透射测量。声子模和高频电子激发的压力依赖性表明，所有三个化合物进行压力诱导的结构相变的临界压力为15 GPa，12 GPa，和10 GPa的CdCr $_2$ O $_4$，HgCr $_2$ S $_4$，和ZnCr $_2$ Se $_4$，分别。的电子跃迁的本征频率是非常接近铬晶体场跃迁的预期值。在硫属化物的情况下，压力引起电子激发的红移，这表明Cr d-带与硫属化物带的强杂化。
英文摘要：
We report pressure-dependent reflection and transmission measurements on ZnCr$_2$Se$_4$, HgCr$_2$S$_4$, and CdCr$_2$O$_4$ single crystals at room temperature over a broad spectral range 200-24000 cm$^{-1}$. The pressure dependence of the phonon modes and the high-frequency electronic excitations indicates that all three compounds undergo a pressure-induced structural phase transition with the critical pressure 15 GPa, 12 GPa, and 10 GPa for CdCr$_2$O$_4$, HgCr$_2$S$_4$, and ZnCr$_2$Se$_4$, respectively. The eigenfrequencies of the electronic transitions are very close to the expected values for chromium crystal-field transitions. In the case of the chalcogenides pressure induces a red shift of the electronic excitation which indicates a strong hybridization of the Cr d-bands with the chalcogenide bands.
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