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Observability of quantum phase fluctuations in cuprate superconductors
H J Kwon1, A T Dorsey, P J Hirschfeld
1Department of Physics and Center for Superconductivity Research, University of Maryland, College Park, Maryland 20742-4111, USA.
Physical Review Letters
|May 1, 2001
Abstract:
We study the order parameter phase fluctuation effects in cuprate superconductors near T = 0, using a quasi-two-dimensional d-wave BCS model. An effective phason theory is obtained which is used to estimate the strength of the fluctuations, the fluctuation correction to the in-plane penetration depth, and the pair-field susceptibility. We find that, while the phase fluctuation effects are difficult to observe in the renormalization of the superfluid phase stiffness, they may be observed in a pair tunneling experiment which measures the pair-field susceptibility.