Ginzburg-Landau theory of the spin-charge-separated system.

摘要: The phenomenological Ginzburg-Landau theory is developed for the resonating-valence-bond state where spin and charge degrees of freedom are separated. We have two order parameters corresponding to fermion pairing Bose condensation, respectively, which coupled with gauge field. find only one transition temperature superconducting {ital T}{sub c}}. Above c}}, a crossover occurs from spin-charge-separated phase Fermi liquid as concentration holes increased. Below penetration length {lambda} given by {lambda}{sup 2}={lambda}{sub F}}{sup 2}+{lambda}{sub B}}{sup 2}. coherence {xi}, on other hand, complicated but predicted increase rapidly approaches overdoped region. There types vortex structure flux quantization hc}/2{ital e} hc}/{ital e}, respectively. In mean-field type-II limit, former stable in almost all cases, latter becomes near c}} low-hole-concentration