Two-Component Superconductivity

摘要: There are two essential attributes of electrons for superconductivity: mobility and pairing. While this is not directly obvious, these compete against each other. High-temperature superconductivity may be obtained by combining two-components, one which provides pairing the other mobility. In local-strong-pairing (negative-U lattice) limit Tc controlled hopping electron pairs rather than pair binding energy. Coupling a negative-U lattice to delocalized states increases thus critical temperature. parallel, Cooper-pair induced in electrons. normal state both Bosonic Fermionic exist, below exist gap. It suggested that new class oxide superconductors due locally paired on oxygen vacancies combined with conducting metal-oxide layers. The discussion includes superconducting properties Tc, Δ, Hc ξ, long wave collective excitations, including resistance tunneling, isotope shift. Unusual predicted neutral Fermion excitations hybridization holes, spreading Femionic gap onset, separation between resistive transition Tc’ evaporation condensate anomalies sound bulk modulii at linear temperature dependence resistivity, voltage tunneling conductance, finite zero bias conductance tunneling. A signature structural coherence can seen channeling experiments probes indicated.