Characterization of the Intra-Unit-Cell magnetic order in   Bi2Sr2CaCu2O8+d
  As in YBa2Cu3O6+x and HgBa2CuO8+d, the pseudo-gap state in Bi2Sr2CaCu2O8+d is characterized by the existence of an intra-unit-cell magnetic order revealed by polarized neutron scattering technique. We report here a supplementary set of polarized neutron scattering measurements for which the direction of the magnetic moment is determined and the magnetic intensity is calibrated in absolute units. The new data allow a close comparison between bilayer systems YBa2Cu3O6+x and Bi2Sr2CaCu2O8+d and rise important questions concerning the range of the magnetic correlations and the role of disorder around optimal doping. 
L. Mangin-Thro, S. De Almeida-Didry, Y. Sidis, F. Giovannelli, I.   Laffez-Monot and P. Bourges
cond-mat.supr-con