The resonant magnetic mode a common feature of high-$T_C$ superconductors.pdf

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The resonant magnetic mode a common feature of high-$T_C$ superconductors.pdf

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The resonant magnetic mode a common feature of high-$T_C$ superconductors

a r X i v : c o n d - m a t / 0 2 1 1 2 2 7 v 1 [ c o n d - m a t .s u p r - c o n ] 1 2 N o v 2 0 0 2 The resonant magnetic mode: a common feature of high-TC superconductors Ph. Bourges a,1, B. Keimer b S. Pailhe?s a L. P. Regnault c Y. Sidis a C. Ulrich b aLaboratoire Le?on Brillouin, CEA-CNRS, CE Saclay, 91191 Gif sur Yvette, France bMax-Planck-Institut fu?r Festko?rperforschung, 70569 Stuttgart, Germany cCEA Grenoble, De?partement de Recherche Fondamentale sur la matie?re Condense?e, 38054 Grenoble cedex 9, France Abstract Inelastic neutron scattering experiments in high-Tc cuprates have evidenced a new magnetic excitation present in the superconducting state. In particular, recent experiments on single layer Tl2Ba2CuO6+δ, performed near optimum doping (Tc ～ 90 K), provide evidence of a sharp magnetic resonant mode below Tc, similar to previous reports on the YBCO and BSCCO bilayer systems. This result supports models that ascribe a key role to magnetic excitations in the mechanism of superconductivity. Key words: Superconductivity; YBa2Cu3O7; Inelastic neutron scattering; Magnetic fluctuations 1. Introduction Fifteen years after the discovery of high-TC super- conductivity, its mechanism is still the subject of vig- orous debate. The experimentally established dx2?y2 - wave symmetry of the superconducting (SC) order parameter favors an origin based on antiferromagnetic (AF) interactions [1]. However, a strong electron- phonon coupling has been inferred from anomalies of the electronic dispersion measured by photoemission spectroscopy experiments [2], among others. The reso- nant magnetic mode observed in the inelastic neutron scattering (INS) spectra in the SC state is one of the most persuasive experimental indications of the im- portance of magnetic interactions for superconductiv- ity in the cuprates. Starting from the YBa2Cu3O6+x (YBCO) system [3,4,5,6,7], numerous INS studies have established the existence of this magnetic excitation mode as a gene