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Angle resolved photoemission (ARPES) data from the electron doped cupratesuperconductor Sm$_{1.86}$Ce$_{0.14}$CuO$_4$ shows a much stronger pseudo-gapor "hot-spot" effect than that observed in other optimally doped $n$-typecuprates. Importantly, these effects are strong enough to drive thezone-diagonal states below the chemical potential, implying that d-wavesuperconductivity in this compound would be of a novel "nodeless" gap variety.The gross features of the Fermi surface topology and low energy electronicstructure are found to be well described by reconstruction of bands by a$\sqrt{2}\times\sqrt{2}$ order. Comparison of the ARPES and optical data fromthe $same$ sample shows that the pseudo-gap energy observed in optical data isconsistent with the inter-band transition energy of the model, allowing us tohave a unified picture of pseudo-gap effects. However, the high energyelectronic structure is found to be inconsistent with such a scenario. We showthat a number of these model inconsistencies can be resolved by considering ashort range ordering or inhomogeneous state.Comment: 5 pages, 4 figure

physical review. b, condensed matter and materials physics

Electronic structure of electron-doped<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mi mathvariant="normal">Sm</mml:mi><mml:mn>1.86</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="normal">Ce</mml:mi><mml:mn>0.14</mml:mn></mml:msub><mml:mi mathvariant="normal">Cu</mml:mi><mml:msub><mml:mi mathvariant="normal">O</mml:mi><mml:mn>4</mml:mn></mml:msub></mml:mrow></mml:math>: Strong pseudogap effects, nodeless gap, and signatures of short-range …

Electronic structure of electron-dopedSm1.86Ce0.14CuO4: Strong pseudogap effects, nodeless gap, and signatures of short-range …