Antiferromagnetic superconducting state in the electron-doped cuprates?

Recent angle-resolved photoemission (ARPES) studies of the electron-doped cuprate Nd$_{2-x}$Ce$_x$CuO$_4$ (NCCO)[1] have been interpreted in terms of a uniform antiferromagnetic (AF) metal, with doping into the upper magnetic band and gap collapse close to optimal doping[2]. An open question is whether the system remains uniform in the simultaneous presence of AF and (d- wave) superconducting (SC) order. Here, we explore the properties of a {\it uniform} AF-SC model for NCCO, to ascertain to what extent we can explain anomalous features, such as the nonmonotonic angle dependence of the superconducting gap[3]. Work supported by the USDOE. \newline \newline [1] N.P. Armitage, {\it et al.,} PRL {\bf 87}, 147003 (2002). \newline [2] C. Kusko, {\it et al.,} PRB{\bf 66}, 140513 (2002); A.-M.S. Tremblay, {\it et al.,} cond-mat/0511334. \newline [3] H. Matsui, {\it et al.,} PRL {\bf 95}, 017003 (2005).