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HoTe$_{3}$, a member of the rare-earth tritelluride ($R$Te$_{3}$) family, andits Pd-intercalated compounds, Pd$_x$HoTe$_{3}$, where superconductivity (SC)sets in as the charge-density wave (CDW) transition is suppressed by theintercalation of a small amount of Pd, are investigated using angle-resolvedphotoemission spectroscopy (ARPES) and electrical resistivity. Twoincommensurate CDWs with perpendicular nesting vectors are observed inHoTe$_{3}$ at low temperatures. With a slight Pd intercalation ($x$ = 0.01),the large CDW gap decreases and the small one increases. The momentumdependence of the gaps along the inner Fermi surface (FS) evolves fromorthorhombicity to near tetragonality, manifesting the competition between twoCDW orders. At $x$ = 0.02, both CDW gaps decreases with the emergence of SC.Further increasing the content of Pd for $x$ = 0.04 will completely suppressthe CDW instabilities and give rise to the maximal SC order. The evolution ofthe electronic structures and electron-phonon couplings (EPCs) of the multipleCDWs upon Pd intercalation are carefully scrutinized. We discuss the interplaybetween multiple CDW orders, and the competition between CDW and SC in detail.

Interplay between multiple charge-density waves and the relationship with superconductivity in Pd$_x$HoTe$_{3}$