BCS theory of superconductivity as modified by Coulomb interaction in cuprates

R. Lal; S. K. Joshi

doi:10.1103/PhysRevB.45.361

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BCS theory of superconductivity as modified by Coulomb interaction in cuprates

R. Lal, S. K. Joshi

DOI 10.1103/PhysRevB.45.361 · Physical Review B

T1

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Abstract

In cuprate superconductors the intraband Coulomb interaction causes a hole to make transitions to other band states of various energies and momenta. The interband interaction causes an indirect interaction between such holes. The net result is that in the superconducting state there will be, on the average, hole pairs with various binding energies along with unbound holes. A modified BCS theory has been developed for such a system. Assuming a phenomenological form for the transition probabilities, the normal-to-superconducting tunneling conductance and the low-temperature specific heat have been calculated for La1.85Sr0.15CuO4 and YBa2Cu3O7. The results are in qualitative agreement with measurements.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown