MAGNETIC POLARONS IN THE HUBBARD MODEL WITH INTERSITE INTERACTIONS

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Abstract
A possible formation of magnetic polarons and bipolarons of small sizes in copper oxides is discussed in the framework of the Hubbard model. The long-range Coulomb interaction prevents the phase separation and stabilizes bipolarons. Magnetic bipolarons have an orbital momentum perpendicular to copper-oxide planes. They can produce a superconducting state. A small concentration of such polarons is sufficient to suppress antiferromagnetism. Exchange interaction of polarons imitates the Pauli paramagnetism.

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