Gapless Chiral Superconducting (d + id)-Wave Phase in Strongly Correlated Layered Material with a Triangular Lattice
| Autor: | T. A. Val’kova, V. V. Val’kov, V. A. Mitskan |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Condensed Matter::Quantum Gases
Superconductivity Physics Condensed matter physics Electronic correlation Solid-state physics High Energy Physics::Lattice General Physics and Astronomy Fermion Electron 01 natural sciences Cobaltite chemistry.chemical_compound Gapless playback chemistry Condensed Matter::Superconductivity 0103 physical sciences Condensed Matter::Strongly Correlated Electrons Hexagonal lattice 010306 general physics |
| Zdroj: | Journal of Experimental and Theoretical Physics. 130:235-246 |
| ISSN: | 1090-6509 1063-7761 |
| Popis: | It is shown that interlayer electron tunneling in the quasi-two-dimensional ensemble of Hubbard fermions leads to the realization of the gapless superconducting phase with the chiral (d + id)-wave order parameter symmetry, not for a single value of sodium ion concentration, but in a wide range of concentrations. Precisely this situation corresponds to experimental data on the layered sodium cobaltite intercalated by water (NaxCoO2 ⋅ yH2O). Intra-atomic electron repulsion that determines the strong electron correlation regime leads to the representation of Hubbard fermions, the interaction of which ensures Cooper instability. Intersite intralayer interactions between fermions considerably affect the positions of nodal points of the chiral order parameter and change the critical concentration at which a topological transition occurs in the 2D system of Hubbard fermions. |
| Databáze: | OpenAIRE |
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