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The two-dimensional Bi2Sr2CaCu2O8+y (Bi2212), the most studied prototypecuprate superconductor, is a lamellar system made of a stack of two-dimensionalcorrugated CuO2 bilayers separated by Bi2O2+ySr2O2 layers. While the largemajority of theories, proposed to interpret unconventional high Tcsuperconductivity in Bi2Sr2CaCu2O8+y, assume a centrosymmetric tetragonal CuO2lattice for the [CuO2]Ca[CuO2] bilayer here we report new compelling resultsproviding evidence for local noncentrosymmetric structure at the Cu site. Wehave measured polarized Cu K-edge XANES (x-ray absorption near edge structure)and the K-edge X-ray magnetic circular dichroism (XMCD) of a Bi2212 singlecrystal near optimum doping. The Cu K edge XMCD signal was measured at ID12beamline of ESRF with the k-vector of x-ray beam parallel to c-axis i.e. withthe electric field of x-ray beam E//ab, using a 17 T magnetic field parallel tothe c-axis of a Bi2212 single crystal. Numerical simulations of the XMCD signalof Bi2212 by multiple scattering theory have shown agreement with theexperimental XMCD signal only for the local structure with noncentrosymmetricBb2b space group of Bi2Sr2CaCu2O8+y.

Local noncentrosymmetric structure of Bi2Sr2CaCu2O8+y by X-ray magnetic circular dichroism at Cu K-edge XANES