ARPES study of T*-phase cuprate superconductor SmLa0.85Sr0.15CuO4-δSmLa0.85Sr0.15CuO4-δ

The electronic structure of the T*-phase cuprate superconductor SmLa0.85Sr0.15CuO4-δSmLa0.85Sr0.15CuO4-δ has been studied by angle-resolved photoemission spectroscopy (ARPES). While a clear Fermi surface has been observed near (π/2,π/2)(π/2,π/2), the electronic band is lowered to ∼-180meV around (π,0)(π,0) due to the pseudogap formation. These features are quite similar to the ARPES result of Ca1.9Na0.1CuO2Cl2Ca1.9Na0.1CuO2Cl2 rather than La2-xSrxCuO4La2-xSrxCuO4. We have also observed a distinct “kink” in the nodal band dispersion as in all the other hole-doped cuprates.