Oxygen Isotope Effect in the $ab$-Plane Reflectance of Underdoped $\mathrm{Y}\mathrm{B}{\mathrm{a}}_{\mathrm{2}}\mathrm{C}{\mathrm{u}}_{\mathrm{3}}{\mathrm{O}}_{\mathrm{7}\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$

Oxygen Isotope Effect in the $a b$ -Plane Reflectance of Underdoped $Y B a_{2} C u_{3} O_{7 - δ}$

N. L. Wang, T. Timusk, J. P. Franck, P. Schweiss, M. Braden, and A. Erb

Phys. Rev. Lett. 89, 087003 – Published 5 August 2002

Abstract

We have measured the effect of oxygen isotope substitution on the $a b$ -plane reflectance of underdoped $Y B a_{2} C u_{3} O_{7 - δ}$ . The frequency shift of the transverse optic phonons due to the substitution of ${}^{16}O$ by ${}^{18}O$ yields an isotope effect of the expected magnitude for copper-oxygen stretching modes with $α = 0.5 \pm 0.1$ . The reflectance shoulder at $400 - 500 c m^{- 1}$ shows a much smaller exponent of $α = 0.1 \pm 0.1$ in the normal state and $α = 0.23 \pm 0.1$ in the superconducting state. These observations suggest that the shoulder is of electronic origin and not due to a phonon mode as has been suggested recently.

Received 31 October 2001

DOI:https://doi.org/10.1103/PhysRevLett.89.087003

Authors & Affiliations

N. L. Wang^* and T. Timusk^†

Department of Physics and Astronomy, McMaster University, Hamilton, Ontario, Canada L8S 4M1

J. P. Franck

Department of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2J1

P. Schweiss, M. Braden^‡, and A. Erb^§

Forschungszentrum Karlsruhe, Institut für Festkörperphysik, P.O.B. 3640, D-76021 Karlsruhe, Germany

^*Present address: Institute of Physics, Chinese Academy of Sciences, P.O. Box 2711, Beijing 100080, People’s Republic of China.
^†Electronic address: timusk@mcmaster.ca
^‡Also at Laboratoire Léon Brillouin, CE Saclay, F-91191 Gif-sur-Yvette, France. Present address: II. Physikalisches Institut der Universität zu Köln, Zuelpicher Strasse 77 D-50937 Köln, Germany
^§Present address: Walther Meissner Institut, Bayerische Akademie der Wissenschaften, D-85748 Garching, Germany.

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Vol. 89, Iss. 8 — 19 August 2002

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Physical Review Letters

Oxygen Isotope Effect in the ab-Plane Reflectance of Underdoped YBa2Cu3O7−δ

N. L. Wang, T. Timusk, J. P. Franck, P. Schweiss, M. Braden, and A. Erb

Phys. Rev. Lett. 89, 087003 – Published 5 August 2002

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Oxygen Isotope Effect in the $a b$ -Plane Reflectance of Underdoped $Y B a_{2} C u_{3} O_{7 - δ}$