FLUCTUATION EFFECTS OF GAUGE-FIELDS IN THE SLAVE-BOSON T-J MODEL

We present a quantitative study of the charge-spin separation (CSS) ph enomenon in a U(1) gauge theory of the t-J model of high-T-c supercond uctors. We calculate the critical temperature T-CSS of a confinement-d econfinement phase transition as a function of hole doping delta, belo w which the CSS takes place. Fluctuations of gauge fields are so large that T-CSS is reduced to about 10% of its mean-field value. We also m ake some comments on the phase structure from a gauge-theoretical poin t of view.