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We report on the epitaxial growth and surface structure of infinite-layercuprate Sr1-xNdxCuO2 films on SrTiO3(001) substrates by combiningozone-assisted molecular beam epitaxy and in situ scanning tunnelingmicroscopy. Careful substrate temperature and flux control has been used toachieve single-phase, stoichiometric, and c-axis oriented films. The surface ofthe films is usually characterized by a mixed CuO2 surface and gridlikesuperstructure. The superstructure exhibits a periodicity of 3.47 nm thatcorresponds to a coincidence lattice between the overlayer peroxide SrO2 andunderlying CuO2 plane, and gives rise to a conductance spectrum that isdistinct from the Mott-Hubbard band structure of CuO2. At a higher Ndcomposition x > 0.1, a (2 x 2) surface characteristic of the hole-doped CuO2emerges, which we ascribe to the intake of apical oxygens in the intervening Srplanes.

Molecular beam epitaxy growth and surface structure of Sr1-xNdxCuO2 cuprate films