Normal-state gap transition in Cu-O superconductors

Joseph Orenstein; G. A. Thomas; D. H. Rapkine; C. G. Bethea; B. F. Levine; R. J. Cava; E. A. Rietman; D. W. Johnson, Jr.

doi:10.1103/PhysRevB.36.729

Normal-state gap transition in Cu-O superconductors

Joseph Orenstein, G. A. Thomas, D. H. Rapkine, C. G. Bethea, B. F. Levine, R. J. Cava, E. A. Rietman, D. W. Johnson, Jr.

DOI 10.1103/PhysRevB.36.729 · Physical Review B

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Abstract

The reflectivity spectra of La2−xSrxCuO4 for x=0 and 0.175, and Ba2YCucO9−δ (δ∼2.1) were measured over a broad frequency range, from 0.005 to 3 eV. In the normal state of these compounds the reflectivity is temperature independent and significantly smaller than expected from the Drude model. We describe a dielectric function which reproduces the main features of the spectra by supplementing the Drude contribution with a strong transition across a gap.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
Ba2YCu3O9-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
BaPb1-xBixO3 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown