Absence of an isotope effect in the magnetic resonance in high-Tc superconductors
S. Pailhès, P. Bourges, Y. Sidis, C. Bernhard, B. Keimer, C. T. Lin, J. L. Tallon
Abstract
An inelastic neutron scattering experiment has been performed in the high-temperature superconductor YBa2Cu3O6.89 to search for an oxygen-isotope shift of the well-known magnetic resonance mode at 41 meV. Contrary to a recent prediction (I. Eremin, et al., Phys. Rev. B 69, 094517 (2004)), a negligible shift (at best ≤ +0.2 meV) of the resonance energy is observed upon oxygen isotope substitution (16O18O). This suggests a negligible spin-phonon interaction in the high-Tc cuprates at optimal doping.
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