Temperature Dependence of Reflectance Spectrum of (SN)xSingle Crystal
JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN(2013)
Abstract
The plasma edge around 2.7 eV in the reflectance spectrum of (SN) x single crystal for E // b -axis polarization shows the blue shift with lowering temperature. The relaxation time of the free electron estimated from the reflectance spectrum at 4.2 K is slightly larger than that of 300 K by the factor of 1.5, resulting in the much smaller temperature dependence of the σ opt (conductivity at optical frequency) compared with that of σ dc (conductivity at dc). Several models which explain these results are discussed.
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Key words
relaxation time,spectrum,single crystal
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