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Effect of phase fluctuations on superconducting states with anisotropic orderparameters is studied in a BCS like lattice model of cuprate superconductors.The degradation of the mean field transition temperature due to phasefluctuations is estimated within a Kosterlitz-Thouless scenario. Values of theinteraction parameters for optimal doping, corresponding to a stablesuperconducting state of $S_{xy}$ symmetry, which fit the nodal structure ofthe superconducting order parameter in the Bi2212 compound, are obtained. Theangular position of the node is found to be insensitive to the dopantconcentration.Comment: Latex file, 8 output pages, 5 figures (available from Authors on  request), to appear in Europhysics Letter

Fluctuation effects and order parameter symmetry in the cuprate superconductors