Spin-charge recombination and superconductivity in the t−J model
Sanjoy K. Sarker
DOI 10.1103/PhysRevB.61.8663 · Physical Review B
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Abstract
A spin-charge binding mechanism is analyzed using the Schwinger boson representation of the two-dimensional t−J model. In the normal state spinons are paired into singlets which evolve out of the antiferromagnetic phase at half-filling. The singlets induce, via the hopping term, a pairing of holons and bind with the latter. The dx2−y2 symmetry of the order parameter and the shape of the Tc vs doping curve, observed in cuprate superconductors, emerge naturally as a consequence of the symmetry of the spinon pairs, thus connecting superconductivity with quantum spin fluctuations in the insulator.
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