Absence of an isotope effect in the magnetic resonance in high-$T_c$ superconductors

S. Pailhès (1) , P. Bourges (1) , Yvan Sidis (1) , C. Bernhard , B. Keimer , C. T. Lin , J. L. Tallon

1 LLB - UMR 12 - Laboratoire Léon Brillouin

An inelastic neutron scattering experiment has been performed in the high-temperature superconductor $\rm YBa_2Cu_3O_{6.89}$ to search for an oxygen-isotope shift of the well-known magnetic resonance mode at 41 meV. Contrary to a recent prediction (I. Eremin, {\it et al.}, Phys. Rev. B {\bf 69}, 094517 (2004)), a negligible shift (at best $\leq$ +0.2 meV) of the resonance energy is observed upon oxygen isotope substitution ($^{16}$O$\to^{18}$O). This suggests a negligible spin-phonon interaction in the high-$T_c$ cuprates at optimal doping.

Domaines: Supraconductivité [cond-mat.supr-con]

S. Pailhès, P. Bourges, Yvan Sidis, C. Bernhard, B. Keimer, et al.. Absence of an isotope effect in the magnetic resonance in high-$T_c$ superconductors. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2005, 71, pp.220507. ⟨10.1103/PhysRevB.71.220507⟩. ⟨hal-00127031⟩