Localization by disorder in the infrared conductivity of Y1-xPrxBa2Cu3O7 films

R. P.S.M. Lobo*, E. Ya Sherman, D. Racah, Y. Dagan, N. Bontemps

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The ab-plane reflectivity of (Y1-xPrx)Ba2Cu3O7 thin films was measured in the 30-30 000 cm-1 range for samples with x=0 (Tc=90 K), x=0.4 (Tc=35 K), and x=0.5 (Tc=19 K) as a function of temperature in the normal state. The effective charge density obtained from the integrated spectral weight decreases with increasing x. The variation is consistent with the higher dc resistivity for x=0.4, but is one order of magnitude smaller than what would be expected for x=0.5. In the latter sample, the conductivity is dominated at all temperatures by a large localization peak. Its magnitude increases as the temperature decreases. We relate this peak to the dc resistivity enhancement. A simple localization-by-disorder model accounts for the optical conductivity of the x=0.5 sample.

Original languageEnglish
Article number104509
Pages (from-to)1045091-1045096
Number of pages6
JournalPhysical Review B - Condensed Matter and Materials Physics
Issue number10
StatePublished - 1 Mar 2002
Externally publishedYes


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