Abstract
We report on measurements of the specific heat of μg-size YBCO single crystals very close to the superconducting transition in zero field. Detailed data points are obtained down to reduced temperatures of 10−5. Analysis of the derivative of the specific heat yields the critical exponents in an unambiguous way. α+ is positive ∼0.5; α- is negative ∼ −0.3. The value of α+ is consistent with gaussian fluctuations above Tc, however the value of α- is inconsistent with either gaussian fluctuations or the 3DXY model.
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Riou, O., Charalambous, M., Gandit, P. et al. Dissymetry of critical exponants in YBCO. Czech J Phys 46 (Suppl 3), 1219–1220 (1996). https://doi.org/10.1007/BF02562724
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DOI: https://doi.org/10.1007/BF02562724