Crystal distortion and the two-channel Kondo effect

We study a simple model of the two-channel Kondo effect in a distorted crys tal. This model is then used to investigate the interplay of the Kondo and Jahn-Teller effects, and also the Kondo effect in an impure crystal. We fin d that the Jahn-Teller interaction modifies the characteristic energy scale of the system below which non-Fermi-liquid properties of the model become apparent The modified energy scale tends to zero as the limit of a purely s tatic Jahn-Teller effect is approached. We find also that the non-Fermi-liq uid properties of the quadrupolar Kondo effect are not stable against cryst al distortion caused by impurities.