Abstract
Abstract A microscopic interpretation is proposed for the behaviour of the superconducting transition temperature Tc as a function of hole concentration p in La2-x Sr x CuO4 when oxygen vacancies are suppressed. At high p ∼ 0.32 a BCS-type formula for Tc is assumed, whereas at low p ∼ 0.06 it is proposed that the holes undergo Wigner crystallization. Near the Wigner transition, one has a strongly correlated hole liquid, and Cooper pair binding will become increasingly difficult as p → 0.06 from above, because the Fermi distribution is strongly changed from the unit step function, appropriate near p ∼ 0.32. Some experiments are proposed to test the microscopic model put forward here.
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