HIGH TEMPERATURE SUPERCONDUCTIVITY AND BERRY PHASE

Abstract

We have analyzed the mechanism of high Tcsuperconductivity from the viewpoint of chirality and Berry phase. It is observed that spin pairing and charge pairing is caused by a gauge force generated by magnetic flux quanta attached to them. Different phase structures associated with high Tcsuperconductivity have been studied from an analysis of the renormalization group equation involving the Berry phase factor μ. It is found that there are two crossovers above the superconducting temperature Tc, one corresponding to the glass phase and the other represents spin gap phase. However, the spin gap temperature [Formula: see text] is found to be dependent on Tcand [Formula: see text] shows a universal behaviour with respect to the hole doping δ/δ0with δ0being the optimal doping rate.