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- W1963520515 abstract "The chemical equilibrium model is based on the idea of correlated electron pairs, which in singlet state can exist as quasimolecules in the superfluid and normal states of a superconductor. These preformed pairs are bosons which can undergo a Bose-Einstein condensation in analogy with the superfluidity of 4 He+ 3 He -mixture. The bosons (B ++ ) and the fermions (h + ) are in chemical equilibrium with respect to the reaction B ++ ⇌ 2 h + , at any temperature. The mean densities of bosons and fermions (quasiholes) n B (T) and n h (T) are determined from the thermodynamics of the equilibrium reaction in terms of a single function f(T). By thermodynamics the function f(T) is connected to equilibrium constant φ (T) by 1-f(T)= [1+φ(T)] -1/2 . Using a simple power law, known to be valid near T=0, for the chemical constant φ(T)=α/t 2γ , t=T/T*, the mean density of quasiholes is given in closed form. This enables one to calculate the corresponding density of states (DOS) D(E)=N S /N(0), by solving an integral equation. The NIS-tunneling conductivity near T=0, given by D(E) compares well with the most recent experiments: D(E)~ E γ , for small E and a finite maximum of right size, corresponding to finite quasiparticle lifetime. The corresponding SIS-tunneling conductivity is obtained from a simple convolution and is also in agreement with recent break junction experiments of Hancotte et al. The position of the maximum can be used to obtain the scaling temperature T*, which comes close to the one measured by Hall coefficient in the normal state. A simple explanation for the spingap effect in NMR is given." @default.
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- W1963520515 date "1999-03-10" @default.
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- W1963520515 title "CHEMICAL EQUILIBRIUM MODEL FOR HIGH-TC AND HEAVY FERMION SUPERCONDUCTORS: THE DENSITY OF STATES" @default.
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- W1963520515 doi "https://doi.org/10.1142/s0217979299000540" @default.
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