Singlet pair liquid, antiferromagnetism and superconductivity in a nearly half-filled narrow band

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Abstract
Anderson's resonating valence bond state is discussed in a simple model of singlet pair liquid, in a nearly half-filled narrow Hubbard band. Besides the spin solitons, the excess holes bound to soliton-antisoliton pairs form an excitation Fermi liquid, in which nesting induces an antiferromagnetic instability near half-filling. A strong attractive interaction between excess holes arises from echange of singlet pairing fluctuations, leading to a superconducting transition with a high critical temperature, maximum at the singlet liquid-paramagnetic transition. Application to the new superconducting oxides is discussed