ScienceAsia 22 (1996): 169-172 |doi: 10.2306/scienceasia1513-1874.1996.22.169

RATIO 2₀/kT_C IN HIGH TEMPERATURE SUPERCONDUCTORS

PONGKAEW UDOMSAMUTHIRUN^a, SAMPAN RATANABURI^b AND SUTHAT YOKSAN^c

ABSTRACT: Within the context of weak-coupling BCS theory, we evaluate the ratio R =2₀/T_C(₀ is zero-temperature energy gap, T, is critical temperature). By assuming the singular density of states of the form A ||+ B, where A, Band a are model parameters and taking correct cut-off limits, we find larger values for R than the recent results of Mattis and Molina, but not large enough to explain the observed experimental results.