Condensation, excitation, pairing, and superfluid density in high-Tc superconductors: the magnetic resonance mode as a roton analogue and a possible spin-mediated pairing

摘要: To find a primary factor determining T c and pairing mechanism in high-T cuprates, we combine the muon spin relaxation results on n s /m* (superconducting carrier density/effective mass), accumulated over last 17 years, with from neutron Raman scattering, scanning tunnelling microscopy, specific heat, Nernst effect, angle-resolved photoemission spectroscopy measurements. We identify magnetic resonance mode as an analogue of roton minimum superfluid 4 He, argue that energy ∞ω res play role underdoped region. propose picture wherein roton-like excitations cuprates appear coupled mode, which has modes for charge responses at different momentum transfers but same transfer, detected respectively by means S = I 0 A 1 g mode. shall call this 'hybrid spin/charge roton'. After discussing dimensionality condensation, generic phase diagram spatial separation overdoped region special case Bose-Einstein to Bardeen-Cooper-Schrieffer crossover conjecture where superconducting coupling is lost rapidly Using microscopic model motion resonating antiferromagnetic fluctuations, possibility hybrid higher-energy fluctuations mediate pairing. In model, can be viewed meson 'dome' shape understood natural consequence departure competing Mott insulator ground state via doping.