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For underdoped quasi-two dimensional cuprate antiferromagnets within the framework of the two-component model of charge carriers (holes and Zhang–Rice polarons) it is considered two near-degenerate states of hole molecular orbitals of one-site cluster Cu2+O42− and two-site cluster Cu2+O42−+Cu2+O42 in CuO2 planes. It is shown that the vibronic mixing of these near-degenerate states with near energies...
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