c-Axis Optical Response of Fully Oxygenated YBa2Cu3O7−δ: Observation of Dirty-Limit-Like Superconductivity and Residual Unpaired Carriers

J. Schützmann; S. Tajima; S. Miyamoto; S. Tanaka

doi:10.1103/PhysRevLett.73.174

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c-Axis Optical Response of Fully Oxygenated YBa2Cu3O7−δ: Observation of Dirty-Limit-Like Superconductivity and Residual Unpaired Carriers

J. Schützmann, S. Tajima, S. Miyamoto, S. Tanaka

DOI 10.1103/PhysRevLett.73.174 · Physical Review Letters

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Abstract

We report on a completely metallic far-infrared c-axis response of YBa2Cu3O7−δ for a fully oxygenated crystal. The normal state is determined by a temperature and frequency dependent scattering rate of the charge carriers. At T≪Tc the spectra are characterized by the onset of an absorption process in the energy range of (4-5) kBTc and by the possible coexistence of paired and unpaired carriers. The estimated anisotropy ratio in the penetration depth (≅8) suggests a unique superconductivity property, dirty-limit-like superconductivity in the c direction and clean limit in the a direction.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	89	Pressure not reported	onset
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	89	Pressure not reported	onset
La2-xSrxCuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown