Phase oscillations between two superconducting condensates in cuprate superconductors
P. V. Shevchenko, O. P. Sushkov
Abstract
Implications of the small Fermi surface are discussed. We demonstrate that superconductivity in this system can be described in terms of two coupled condensates. The two condensates result in a collective excitation corresponding to the relative phase oscillation - a phason. We discuss the possibility of searching for this collective excitation in the dynamic resistance of the SQUID.
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