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Surface symmetry breaking and disorder effects on superconductivity in perovskite <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:msub><mml:mi>BaBi</mml:mi><mml:mn>3</mml:mn></mml:msub></mml:math> epitaxial films
The structural or electronic symmetry breaking of the host lattice is a recurrent phenomenon in many quantum materials, including superconductors. Yet, how these broken-symmetry states affect the electronic pair wave function of superconductivity has been rarely elucidated. Here, using low-temperature scanning-tunneling microscopy and first-principles calculations, we identify the broken rotational …