Phenomenological and spectroscopic evidence for defect-induced high-temperature superconductivity

J. C. Phillips

doi:10.1103/PhysRevB.45.12647

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Phenomenological and spectroscopic evidence for defect-induced high-temperature superconductivity

J. C. Phillips

DOI 10.1103/PhysRevB.45.12647 · Physical Review B

T1

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Abstract

Two models can provide the strong coupling required to explain high-temperature superconductivity with the established Fröhlich-Bardeen electron-phonon interaction. One utilizes quasi-two-dimensional energy bands with EF pinned by the logarithmic saddle-point singularity in N(E), while the other uses defect enhancement of N(EF). Two kind of composition-dependent experimental data—Tc itself, and spectroscopic measurements of N(EF) and E(k)—can be used to distinguish these models. Overall both kinds of data favor defect enhancement.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O6+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Bi2Sr2CaCu2O8+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Tl2Ba2CuO6+y Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Ba1-xKxBiO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown