Underlying mechanisms of pseudogap phenomena and Bose-liquid superconductivity in high- T c cuprates

Autor: S. Dzhumanov, Sh.S. Djumanov, E.X. Karimboev
Rok vydání: 2016
Předmět:
Zdroj: Physics Letters A. 380:2173-2180
ISSN: 0375-9601
Popis: We show that the high- T c cuprates are non-BCS superconductors exhibiting distinct pseudogap (PG) behaviors (related to real and momentum space excitations) and other anomalies above T c , novel Bose-liquid superconductivity below T c , and also a λ -like superconducting (SC) transition at T c similar to the λ transition in liquid 4 He. In these materials, the relevant charge carriers are polarons which are bound into bosonic Cooper pairs above T c followed by condensing into a Bose superfluid at T c . We found that the polaronic effects and related PG weaken with increasing of the doping level and disappear in the overdoped region, where the crossover from Bose-liquid to Fermi-liquid (BCS-type) superconductivity occurs at the quantum critical point. We identify the real phase diagrams of the cuprates, the PG and vortex-like states above T c , the novel SC state and two distinct SC phases below T c like two superfluid phases of 3 He, and explain the rich cuprate phenomenology from lightly doped to overdoped region.
Databáze: OpenAIRE