Abstract
A Mossbauer emission spectroscopy study on the 67Cu(67Zn) isotope showed that the superconducting transition in the Nd1.85Ce0.15CuO4, La1.85Sr0.15CuO4, and Tl2Ba2CaCu2O8 compounds is accompanied by an electron density redistribution in the crystal, which is considered evidence of Cooper-pair Bose condensation.
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