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Nematicity from mixed<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>S</mml:mi><mml:mo>±</mml:mo></mml:msub><mml:mo>+</mml:mo><mml:msub><mml:mi>d</mml:mi><mml:mrow><mml:msup><mml:mi>x</mml:mi><mml:mn>2</mml:mn></mml:msup><mml:mo>−</mml:mo><mml:msup><mml:mi>y</mml:mi><mml:mn>2</mml:mn></mml:msup></mml:mrow></mml:msub></mml:mrow></mml:math>states in iron-based superconductors
We propose a novel mechanism for nematicity potentially relevant in some iron-based superconductors (SCs). We demonstrate that the mixed ${S}_{\ifmmode\pm\else\textpm\fi{}}+{d}_{{x}^{2}\ensuremath{-}{y}^{2}}$ SC state is a physically accessible state and may emerge under generic conditions, lowering spontaneously the fourfold rotational symmetry ${C}_{4}$ to ${C}_{2}$. We provide a detailed study of the mixed …