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    The intra- and intergranular superconducting correlations in YBa 2 Cu 3 O 7− δ are characterized by the ac susceptibility measurements. The effective susceptibility is measured as a function of temperature by the Electron-Spin-Resonance (ESR) method, using two DPPH paramagnetic markers placed on the surface of a cylindrical superconducting sample. The appearance of two separate ESR lines at T c confirms the values of critical transition temperatures determined by the ac susceptibility.
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