Absence of an isotope effect in the magnetic resonance in high-Tc superconductors
Pailhès, S. · Bourges, P. · Sidis, Y. · Bernhard, C. · Keimer, B. · Lin, C. T. · Tallon, J. L.
Original · EN
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 (¹⁶O→¹⁸O). This suggests a negligible spin-phonon interaction in the high-Tc cuprates at optimal doping.
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