Anomalous oxygen isotope effect on the in-plane FIR conductivity of detwinned YBa2Cu316,18O6.9
C. Bernhard, T. Holden, A. V. Boris, N. N. Kovaleva, A. V. Pimenov, J. Humlicek, C. Ulrich, C. T. Lin, J. L. Tallon
Abstract
We observe an anomalous oxygen isotope effect on the a-axis component of the far-infrared electronic response of detwinned YBa2Cu316,18O6.9. For 18O a pronounced low-energy electronic mode (LEM) appears around 240 cm-1. This a-axis LEM exhibits a clear aging effect, after one year it is shifted to 190 cm-1. For 16O we cannot resolve a corresponding a-axis LEM above 120 cm-1. We interpret the LEM in terms of a collective electronic mode that is pinned by `isotopic defects', i.e. by the residual 16O in the matrix of 18O.
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