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Angle-Resolved Photoemission Spectroscopy of the Antiferromagnetic Superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mrow><mml:mi mathvariant="normal">N</mml:mi><mml:mi mathvariant="normal">d</mml:mi></mml:mrow><mml:mn>1.87</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi><mml:mi mathvariant="normal">e</mml:mi></mml:mrow><mml:mn>0.13</mml:mn></mml:msub><mml:msub><mml:mrow><mml:mi mathvariant="normal">C</mml:mi><…
We performed high-resolution angle-resolved photoemission spectroscopy on ${\mathrm{N}\mathrm{d}}_{1.87}{\mathrm{C}\mathrm{e}}_{0.13}{\mathrm{C}\mathrm{u}\mathrm{O}}_{4}$, which is located at the boundary of the antiferromagnetic (AF) and the superconducting phase. We observed that the quasiparticle (QP) effective mass around $(\ensuremath{\pi},0)$ is strongly enhanced due to the opening of the AF gap. The QP mass and the AF gap …