Abstract
Abstract Effects of the short wavelength fluctuations on the specific heat ΔC in a superconductor are studied within the scheme of the Aslamazov-Larkin (AL) theory. By imposing the momentum cutoff in the fluctuation spectrum, formulae for ΔC are derived in a layered system as well as in n -dimensional ( n D) systems ( n =1, 2 and 3). Formulae under a total-energy cutoff condition are also presented. It is found that ΔC is significantly suppressed at high-reduced temperatures in a similar manner as in the paraconductivity. Our formulae in 3D and layered systems may be better fitted to experiments on YBa2Cu3O7-δ crystals in a wider temperature region than the standard AL formulae without any cutoff effect.
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