Polaron Effects in CdF2: m(polaron)m(free)=11±1

Abstract

A polaron mass of $11m_e$ was measured by cyclotron resonance of photocarriers induced in semiconducting rare-earth-doped Cd${\mathrm{F}}_2$ between 1 and 4.5°K. A sharp transition at 178 ${\mathrm{cm}}^{-1\mathrm{}}$ is interpreted in terms of transitions between states of a polaron trapped by a rare-earth ion.