NON-FERMI-LIQUID BEHAVIOR FOR HOLES IN DOPED 2-DIMENSIONAL ANTIFERROMAGNETS

Spin and hole excitations are investigated in the doped two-dimensional (2D) antiferromagnets described by the t-J model based on the spin-wave approximation. The polarizability of spin excitations is found to be consistent with the marginal-Fermi-liquid hypothesis. As a consequence, the imaginary part of the self-energy for holes scattered by the spin excitations is demonstrated to give a linear dependence in temperature T (for ω<T) and in frequency ω (for ω>T). © 1995 The American Physical Society.