SYMMETRY ANALYSIS OF THE FERMI-SURFACE OF BI2SR2CACU2O8 BY DISPLAY ANALYZER

We have directly observed the Fermi surface of Bi2Sr2CaCu2O8(Bi(2212)) by a display-type angle-resolved photoelectron spectrometer. The expe riment was done at room temperature by using linearly-polarized synchr otron radiation (SR). The photon energy was 32 eV and the incident ang le of the photon was perpendicular to the sample surface. Photoelectro n angular distribution (PEAD) patterns were measured at various azimut hal angles phi from 0 degrees to 135 degrees in steps of 22.5 degrees, where phi is the angle between the direction of the electric vector o f the photon and the sample Cu-O bond direction. The observed shape of the Fermi surface is consistent with the band calculation by the FLAP W method [S. Massidda et al., Physica C 152 (1988) 251]. We confirmed the symmetry of the atomic orbital constituting the Fermi surface to b e d(x2-y2) by 'orbital determination by angular distribution' (ODAD). (C) 1998 Elsevier Science B.V.