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Symmetry-breaking electronic phase in unconventional high-temperature(high-Tc) superconductors is a fascinating issue in condensed-matter physics,among which the most attractive phases are charge density wave (CDW) phase withfour unit-cell periodicity in cuprates and nematic phase breaking the C4rotational symmetry in iron-based superconductors (FeSCs). Recently, pairdensity wave (PDW), an exotic superconducting phase with non-zero momentumCooper pairs, has been observed in high-Tc cuprates and the monolayer FeSC.However, the interplay between the CDW, PDW and nematic phase remains to beexplored. Here, using scanning tunneling microscopy/spectroscopy, we detectedcommensurate CDW and CDW-induced PDW orders with the same period of lambda =4aFe (aFe is the distance between neighboring Fe atoms) in a monolayer high-TcFe(Te,Se) film grown on SrTiO3(001) substrate. Further analyses demonstrate theobserved CDW is a smectic order, which breaks both translation and C4rotational symmetry. Moreover, the smecticity of the CDW order is strongestnear the superconducting gap but weakens near defects and in an appliedmagnetic field, indicating the interplay between the smectic CDW and PDWorders. Our works provide a new platform to study the intertwined orders andtheir interactions in high-Tc superconductors.

Intertwined charge and pair density orders in a monolayer high-Tc iron-based superconductor