THERMODYNAMICS OF SUPERCONDUCTING BI2SR2CA2CU3O10 IN THE CRITICAL FLUCTUATION REGION NEAR THE H(C2)(T) LINE

We report a detailed study of the temperature and magnetic-field depen dence of free energy, magnetization, and specific heat of superconduct ing Bi2Sr2Ca2Cu3O10 in the critical fluctuation region near H(c2)(T) l ine. Our approach is to apply the recently developed nonperturbative s caling theory (Tesanovic et al.) in high fields to describe the revers ible magnetization data taken on a c-axis-oriented superconducting Bi2 Sr2Ca2Cu3O10 thin tape. We find good agreement on some of the supercon ducting parameters obtained in the present study with those derived by applying the Ginzburg-Landau theory to our reversible magnetization d ata taken outside the critical fluctuation region.