Specific heat for a strong-coupling superconductor with logarithmic electronic density of states
M. Mansor, J. P. Carbotte
DOI 10.1103/PhysRevB.47.9029 · Physical Review B
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Abstract
We find that a Van Hove singularity can affect the temperature (T) variation of the electronic-specific-heat difference between the superconducting and normal states ΔC(T). It shifts the zero in this quantity away, rather than towards Tc as is indicated in some experiments in the copper oxides. To carry out the calculations we have generalized the Bardeen-Stephan formula for the free-energy difference between the normal and superconducting states, and the Eliashberg equations on the imaginary-frequency axis to include explicitly a logarithmic electronic density of states (a Van Hove singularity) with normal- and paramagnetic-impurity scattering included.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi1.6Pb0.4Sr2Ca2Cu3O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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