Abstract
Reflectivity spectra of Te have been measured in the energy range from 0.5 to 3.8 eV at pressures up to 96 kbar using a diamond anvil cell. Optical conductivity spectra sigma ( omega ) have been derived from the reflectivity by using an oscillator fitting analysis. The sigma ( omega ) spectrum for trigonal Te at 1 kbar has a main peak at 2.2 eV and a shoulder around 1.2 eV. These peaks shift to lower energy and grow with increasing pressure. When Te is transformed into a monoclinic phase around 40 kbar, a Drude term appears in the low-energy region of the sigma ( omega ) spectrum, which suggests that monoclinic Te has a metallic nature. In the orthorhombic phase at 73 kbar, a main peak at 0.5 eV and a shoulder around 1.2 eV are observed for the sigma ( omega ) spectrum. These changes in the sigma ( omega ) spectra of Te with pressure are discussed in comparison with the results of band calculations.
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