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: |
Condensed Matter::Quantum Gases
Superconductivity Physics Condensed matter physics Condensed Matter::Other General Physics and Astronomy 02 engineering and technology 021001 nanoscience & nanotechnology Polaron 01 natural sciences Superfluidity Condensed Matter::Superconductivity Quantum critical point 0103 physical sciences Condensed Matter::Strongly Correlated Electrons Cuprate Cooper pair 010306 general physics 0210 nano-technology Pseudogap Phase diagram |
| 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 |
| Externí odkaz: |
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