Optical properties of overdoped YBa2Cu3Ox || C : evidence for superconductivity in the chains

J. Münzel; A. Zibold; H. P. Geserich; Th. Wolf

doi:10.1209/epl/i1996-00313-4

All issues

Volume 33 / No 2 (January II 1996)

Europhys. Lett., 33 2 (1996) 147-152

Abstract

Issue		Europhys. Lett. Volume 33, Number 2, January II 1996


Page(s)		147 - 152
Section		Condensed matter: electronic structure, electrical, magnetic and optical properties
DOI		https://doi.org/10.1209/epl/i1996-00313-4
Published online		01 September 2002

Europhys. Lett., 33 (2), pp. 147-152 (1996)

Optical properties of overdoped YBa₂Cu₃O_x || C : evidence for superconductivity in the chains

J. Münzel¹, A. Zibold¹, H. P. Geserich¹ and Th. Wolf²

¹ Institut für angewandte Physik, Universität Karlsruhe D-76128 Karlsruhe, Germany
² Forschungszentrum Karlsruhe, Institut für Technische Physik D-76021 Karlsruhe, Germany

Received: 26 June 1995
Accepted: 1 December 1995

Abstract

We report on temperature-dependent reflectance measurements on several $\rm YBa_2Cu_3O_x$ single crystals with $6.8\le x \le 7$ in the far-infrared range (5 meV $<\hbar \omega <100$ meV) with ${\bf E}\| c$ . Performing a Kramers-Kronig transformation, we derive the optical conductivity $\sigma_{\|c} (\hbar \omega)$ and the real part of the dielectric constant $\epsilon_{1\|c} (\hbar \omega)$ . Fitting the data with a two-fluid model, we obtained the superfluid carrier density and the scattering rate. The crystals of oxygen content x< 6.93, i.e., below the maximum value of T_c, show a linear dependence of the superfluid carrier density with temperature, consistent with the $d-$ wave model. The data for the overdoped crystals give evidence for superconductivity of the chain carriers.

PACS: 74.25.Nf – Response to electromagnetic fields (nuclear magnetic resonance, surface impedance, etc.) / 74.72.Bk – Y-based compounds / 78.30.-j – Infrared and Raman spectra and scattering

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