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We present electrical resistivity and ac-susceptibility measurements ofGdTe$_3$, TbTe$_3$ and DyTe$_3$ performed under pressure. An uppercharge-density-wave (CDW) is suppressed at a rate of$\mathrm{d}T_{\mathrm{CDW,1}}/\mathrm{d}P$ = $-$85 K/GPa. For TbTe$_3$ andDyTe$_3$, a second CDW below $T_{\mathrm{CDW,2}}$ increases with pressure untilit reaches the $T_{\mathrm{CDW,1}}$($P$) line. For GdTe$_3$, the lower CDWemerges as pressure is increased above $\sim$ 1 GPa. As these two CDW statesare suppressed with pressure, superconductivity (SC) appears in the threecompounds at lower temperatures. Ac-susceptibility experiments performed onTbTe$_3$ provide compelling evidence for bulk SC in the low-pressure region ofthe phase diagram. We provide measurements of superconducting critical fieldsand discuss the origin of a high-pressure superconducting phase occurring above5 GPa.

Pressure dependence of the charge-density-wave and superconducting states in GdTe$_3$, TbTe$_3$ and DyTe$_3$