No abstract

No abstract

No abstract

No abstract

We report on a completely metallic far-infrared c-axis response of YBa2Cu307 & for a fully oxygenated crystal. The normal state is determined by a temperature and frequency dependent scattering rate of the charge carriers. At T && T, the spectra are characterized by the onset of an absorption process in the energy range of (4 5)k~T-, 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.