Abstract
The specific heat of single crystals of HgBa2Ca2Cu3O8+δ and HgBa2CuO4+δ have been measured in fields up to 7 T, by a sensitive ac technique capable of measuring microgram samples. For both Hg-based superconductors there is evidence of strong thermal fluctuations in the specific heat with the mean-field step being replaced by a quasi-logarithmic divergence ofC atT c in zero field. The almost symmetric shape of the anomaly is in sharp contrast to that observed in YBa2Cu3O6.95, and seems to be intrinsic to the quasi-two-dimensional high-T c superconductors. In increasing field there is a strong reduction in the height of the anomaly with the peak position being only weakly shifted to lower temperature. The applicability of fluctuation theories to the data will be discussed.
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Carrington, A., Marcenat, C., Bouquet, F. et al. Specific heat of Hg-based high temperature superconductors nearT c . Czech J Phys 46 (Suppl 6), 3177–3184 (1996). https://doi.org/10.1007/BF02548127
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DOI: https://doi.org/10.1007/BF02548127