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Direct visualization of sign-reversal<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msup><mml:mi>s</mml:mi><mml:mo>±</mml:mo></mml:msup></mml:math>superconducting gaps in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>FeTe</mml:mi><mml:mrow><mml:mn>0.55</mml:mn></mml:mrow></mml:msub><mml:msub><mml:mi>Se</mml:mi><mml:mrow><mml:mn>0.45</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>
In many unconventional superconductors the pairing of electrons is driven by the repulsive interaction, which leads to the sign reversal of superconducting gaps along the Fermi surfaces or between them. However, to measure this sign change is not easy and straightforward. It is known that, in superconductors with sign reversal …