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Twolevel Systems in Fluorite Mixed Crystals
Farinfrared Impurity Modes in Doped Alkaline Earth Fluoride
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1.4 K absorption A. J. Sievers absorption bands absorption coefficient absorption spectra absorption strength amorphous materials Amorphous Solids annealed as-grown background absorption BaF2 CaF2 doped change in absorption Chapter Chem clusters cm-1 band concentration dependence concentration samples cryostat curves decrease defect structure degassed density dielectric constant distribution of TLS's dopant concentration dopant ion doped samples doublet energy-loss function excited state transitions far-ir absorption Figure fill fraction fluorite mixed crystals Frequency cm-1 frequency dependence fullerenes fullerite G(co glass-like behavior H2O molecules heat treatment higher frequency higher temperatures increasing temperature ionic radius LaF3 lattice Lett librational longitudinal loss functions low concentration low frequency low temperature LST relation magnetic field measurements mixed crystal systems peak phonon Phys predicted present quenched relaxation resonant mode reststrahlen shift in frequency shown in Fig solid spectrum symmetry temperature dependent absorption temperature induced change toluene transverse tunnel splitting Y3+ ions zero ZnS-diamond composites