Far-infrared c-axis conductivity of flux-grown Y${}_{1-x}$Pr${}_x$Ba${}_2$Cu${}_3$O${}_7$ single crystals studied by spectral ellipsometry

Abstract

The far-infrared c-axis conductivity of flux-grown Y${}_{1-x}$Pr${}_x$Ba${}_2$Cu${}_3$O${}_7$ single crystals with 0.2$\le$x$\le$0.5 has been studied by sepectral ellipsometry. We find that the c-axis response exhibits spectral features similar to deoxygenated underdoped YBa${}_2$Cu${}_3$O${}_{7-\delta }$, i.e., a pseudogap develops in the normal state, the phonon mode at 320 cm${}^{-1}$ exhibits an anomalous T-dependence and an additional absorption peak forms at T. This suggests that the T${}_c$ suppression in flux grown Pr-substituted crystals is caused by a decrease of the hole content and/or by carrier localization rather than by pair breaking.

arXiv commentsubmitted to PRB on 5.4.2000

References in corpus (3)

• Observation of out-of-phase bilayer plasmons in YBa_2Cu_3O_7-delta
• Anomalies of the infrared-active phonons in underdoped YBCO as an evidence for the intra-bilayer Josephson effect
• The anomaly of the oxygen bond-bending mode at 320 cm${}^{-1}$ and the additional absorption peak in the c-axis infrared conductivity of underdoped YBa${}_2$Cu${}_3$O${}_{7-\delta }$ single crystals revisited by ellipsometricmeasurements

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• The Mysterious Pseudogap in High Temperature Superconductivity, an Infrared View
• The role of magnetism in forming the c-axis spectral peak at 400 cm-1 in high-temperature superconductors
• Localization by disorder in the infrared conductivity of (Y,Pr)Ba2Cu3O7 films
• Microscopic gauge-invariant theory of the c-axis infrared response of bilayer cuprate superconductors and the origin of the superconductivity induced absorption bands
• Planar 17O NMR study of Pr_yY_{1-y}Ba_2Cu_3O_{6+x}