Abstract
High resolution specific heat measurements of Bi 2Sr 2CaCu 2O 8+x superconductors in magnetic fields up to 16 Tesla are presented. In a polycrystalline sample the magnetic field leads to a drastic suppression and a pronounced broadening of the anomaly at T c. In contrast, our measurements on a high quality single crystal for fields parallel to the CuO 2-layers do not show any significant suppression of the specific heat at T c. Moreover, the specific heat above T c, which is attributed to superconducting fluctuations, decreases. As a consequence the anomaly at T c appears to become sharper with increasing magnetic field.
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