Electron-phonon contribution to thermopower in Si-doped superconducting Bi compounds

J. Giraldo; J. E. Rodríguez; A. Mariño

doi:10.1103/PhysRevB.56.2383

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Electron-phonon contribution to thermopower in Si-doped superconducting Bi compounds

J. Giraldo, J. E. Rodríguez, A. Mariño

DOI 10.1103/PhysRevB.56.2383 · Physical Review B

T1

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Abstract

Resistivity ρ and thermoelectric power S as a function of temperature on samples of nominal composition (Bi0.8Pb0.2)2Sr2Ca3(Cu1−xSix)4O12−δ, for different x values at small concentrations, have been carried out. We find a correlation between ρ and an enhancement in S observed above Tc. We analyze the results in terms of conventional theoretical models that include vertex and other electron-phonon (e−p) corrections to the scattering due to impurities. It is argued that in the copper oxides the e−p effects, usually negligible in normal metals at temperatures small compared to the Debye temperature, might be significant near and above Tc. A small contribution due to the phonon drag effect is also discussed. It is suggested that the trends of our results adjust to the predictions of those conventional models.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
(Bi0.8Pb0.2)2Sr2Ca3(Cu1-xSix)4O12-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	110	Pressure not reported	onset
(Bi0.8Pb0.2)2Sr2Ca3(Cu1-xSix)4O12-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	110	Pressure not reported	onset