1998/10/05 by I. Tifrea, I. Ţifrea, I. Grosu +5
Physics and Astronomy · #FOS: Physical sciences #Physics of Superconductivity and Magnetism #Quantum many-body systems #Superconductivity (cond-mat.supr-con) #Theoretical and Computational Physics #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/9810034
Revtex
arxiv created 1998/10/05 · openalex publication_date 1998/10/05 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We investigate the fluctuation contribution to the specific heat of a two-dimensional superconductor with a non-Fermi normal state described by a Anderson Green's function G(k,iω)=ωc-α/(iω-εk)1-α. The specific heat corrections contain a term proportional to (T^2α-Tc2α)-1 and another logarithmic one. We defined a coherence length as function of the non-Fermi parameter α, which showed that a crossover study between BCS and Bose-Einstein condensation is possible by varying α in an interval 0 ÷αcr. By comparing our theoretical results with the experimental data for HTSC materials, we reobtained the value for α, corresponding to such systems, of the order 0.3 ÷0.45. We also reobtained the critical temperature for such a superconductor using the Thouless criterion.