Determination of the superconducting gap in RBa2Cu3O7−δ

B. Friedl; C. Thomsen; M. Cardona

doi:10.1103/PhysRevLett.65.915

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Determination of the superconducting gap in RBa2Cu3O7−δ

B. Friedl, C. Thomsen, M. Cardona

DOI 10.1103/PhysRevLett.65.915 · Physical Review Letters

T1

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Abstract

The anomalous broadening of the B1g-like phonon of RBa2Cu3O7−δ observed in Raman scattering is studied as a function of phonon frequency by substituting various rare earths for R. The onset of broadening starts abruptly at a phonon energy which allows us to unambiguously determine a single, sharp superconducting gap at 2Δ=316 cm−1. 2Δ/kTc=4.95±0.10, i.e., RBa2Cu3O7−δ is a strong-coupling superconductor. We find qualitative and quantitative agreement with theory.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
EuBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92	Pressure not reported	unknown
DyBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92	Pressure not reported	unknown
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92	Pressure not reported	unknown
ErBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92	Pressure not reported	unknown
TmBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	92	Pressure not reported	unknown