Neutral fermion, charge- e boson excitations in the resonating-valence-bond state and superconductivity in La2 CuO4 -based compounds
Z. Zou, Philip Warren Anderson
We derive the neutral fermion excitation spectrum in the resonating-valence-bond state based on a fermion-boson field theory. It is formally shown that charge-$e$ bosons are created upon doping while the neutral fermion excitation remains gapless, predicting a linear low-temperature specific heat $C\ensuremath{\propto}\ensuremath{\gamma}T$ in the superconducting state. Bose condensation in doped samples leads to the observed superconductivity with true "off-diagonal long-range order."
Physical review. B, Condensed matter•Jan 1, 1988•268 citations