DYNAMICS OF DISORDERED HEAVY-FERMION SYSTEMS

Dynamics of the disordered heavy-fermion model of Miranda et al. are c alculated using an expression for the spectral function of the Anderso n model that is consistent with quantum Monte Carlo results. We comput e Sigma(omega) for three distributions of Kondo scales including the d istribution of Bernal et al. for UCu(5-)xPd(x). The corresponding low- temperature optical conductivity shows a low-frequency pseudogap, a ne gative optical mass enhancement, and a linear in frequency transport s cattering rate, consistent with results in Y(1-x)UxPd(3) and UCu5-xPdx . The formalism is strictly valid for a dilute system of Kondo scatter ers like Y1-xUxPd3, but the leading frequency behavior at low T (much lower than bulk T-k) hold for lattice systems as well.