Nature of striped phases in cuprates with x ~ 1/8

Charles Patterson

University of Dublin, Trinity College, School of Physics, Dublin, Ireland

Recent scanning tunnelling spectroscopy (STS) measurements [1] on the oxychloride cuprate, Ca2-xNaxCuO2Cl2, have shown that 1-D stripes, separated by four lattice constants, form in CuO2 planes when x ~ 1/8. We have performed hybrid density functional calculations on Ca1.88Na0.12CuO2Cl2 with magnetic anti-phase boundaries (APB) separated by four lattice constants. States at the Fermi level are localised on Cu-O-Cu units in APB and the Fermi surface is approximately two straight lines at +-pi/4. Photoemission from several cuprate systems with x ~ 1/8 indicates this type of Fermi surface and so stripes may be arise from localisation of holes at magnetic APB. [1] Y. Kohsaka et al. Science 315, 1380 (2007).

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