CHARGE EXCITATION AND THE NORMAL-STATE TRANSPORT-PROPERTIES IN THE FLUX-BINDING PHASE OF THE T-J MODEL

Elementary excitations are discussed in the flux-binding phase [Weng, Sheng, and Ting, Phys. Rev. B 49, 607 (1994)] of the t-J model. It is shown that the density and current constraints in the gauge-theory des cription will dramatically modify the charge excitations. An effective Lagrangian for the normal state of the flux-binding phase is derived, and based on it the transport properties are studied. We find that th e resistivity is linearly temperature dependent with a relaxation rate HBAR/tau congruent-to 2k(B)T, and the Hall coefficient involves a sec ond relaxation rate with the cotangent Hall angle following a T2 law. Furthermore, the thermopower exhibits a strong doping dependence. All these features are in good agreement with the transport measurements o f the high-T(c) copper-oxide compounds.