2000/03/08 by K. Levin, Qijin Chen, Ioan Kosztin · 1 citation
Engineering · Physics and Astronomy · #Physics of Superconductivity and Magnetism #Superconducting Materials and Applications #Superconductivity in MgB2 and Alloys #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.1016/s0921-4534(00)00711-5
published as Physica C 341, Pt.2, 851 (2000) · M2S-HTSC-VI conference paper, (4 pages, 1 figure), using Elsevier style espcrc2.sty
arxiv created 2000/03/08 · openalex publication_date 2000/11/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
On the basis of the observed short coherence lengths in the cuprates we argue that a BCS-Bose-Einstein condensation (BEC) crossover approach is an appropriate starting point for correcting the mean field approach of BCS and, thereby, for addressing pseudogap phenomena in these materials. Our version of the BCS-BEC approach is based on a particular Greens' function decoupling scheme which should be differentiated from others in the literature, and which yields (i) the Leggett crossover ground state (for all coupling constants g, at T=0) and (ii) BCS theory (for all T ≤ Tc over a range of small g). In this paper we provide a simple physical picture of the pseudogap phase above and below Tc, and review the quantitative and qualitative implications of this theory, which, for the most part have been published in a series of recent papers.