Anomalous oxygen isotope effect on the in-plane FIR conductivity of detwinned YBa2Cu3$^{16,18}$O$_{6.9}$

A.V. Boris; A.V. Pimenov; C. Bernhard; C.T. Lin; C. Ulrich; J. Humlicek; J.L. Tallon; N.N. Kovaleva; T. Holden

arxiv: cond-mat/0306097 · v1 · submitted 2003-06-04 · ❄️ cond-mat.supr-con

Anomalous oxygen isotope effect on the in-plane FIR conductivity of detwinned YBa2Cu3^(16,18)O_(6.9)

C. Bernhard , T. Holden , A.V. Boris , N.N. Kovaleva , A.V. Pimenov , J. Humlicek , C. Ulrich , C.T. Lin

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J.L. Tallon

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keywords a-axiseffectelectronicanomalousdetwinnedisotopemodeoxygen

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We observe an anomalous oxygen isotope effect on the a-axis component of the far-infrared electronic response of detwinned YBa2Cu3$^{16,18}$O$_{6.9}$. For $^{18}$O 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 $^{16}$O 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 $^{16}$O in the matrix of $^{18}$O.

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Anomalous oxygen isotope effect on the in-plane FIR conductivity of detwinned YBa2Cu3^(16,18)O_(6.9)

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