Optical interband transitions in semi- and superconducting La2−xSrxCuO4, x=0 and x=0.15

F. A. Benko; G. Abdussalam; F. S. Razavi; F. P. Koffyberg

doi:10.1103/PhysRevB.38.2820

← Back to search

Optical interband transitions in semi- and superconducting La2−xSrxCuO4, x=0 and x=0.15

F. A. Benko, G. Abdussalam, F. S. Razavi, F. P. Koffyberg

DOI 10.1103/PhysRevB.38.2820 · Physical Review B

T1

Active bibliographic source — not scientific approval

Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.

Abstract

Photocurrent measurements across junctions between polycrystalline La2−xSrxCuO4 and aqueous electrolyte show that the valence-band edge of the oxide is at 4.8 eV below the vacuum level for both x=0 and x=0.15. From an analysis of the photocurrent spectra interband transitions are found at 1.75 eV (indirect) and 2.19 eV (direct) in La2CuO4, and at 1.59 eV (indirect) and 2.60 eV (direct) in La1.85Sr0.15CuO4.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
La2CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	15	Pressure not reported	zero_resistance
La1.85Sr0.15CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	40	Pressure not reported	onset