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Electron doping evolution of the magnetic excitations in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>NaFe</mml:mi><mml:mrow><mml:mn>1</mml:mn><mml:mo>โ</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub><mml:msub><mml:mi>Co</mml:mi><mml:mi>x</mml:mi></mml:msub><mml:mi>As</mml:mi></mml:mrow></mml:math>
Because of the unconventional nature of high-temperature superconductors, it has been proposed that magnons, rather than phonons, play an important role in Cooper pair formation. It is therefore of great importance to understand how magnetic excitations behave and evolve between superconducting and nonsuperconducting compounds. In this work, the authors present โฆ