Pressure-Tuned Superconducting Dome and Persistent Charge-Density-Wave Order in NdSeTe2.

In many charge-density-wave (CDW) materials, superconductivity emerges as CDW order collapses, producing a dome-shaped phase diagram commonly associated with quantum criticality or direct competition between the two orders. Here, a distinct pressure-tuned case is identified in NdSeTe2, where the superconducting dome is fully embedded within a persistent CDW state. Electrical resistivity measurements reveal a conventional superconducting dome with a maximum transition temperature of TC ≈ 1.8 K near PC ≈ 2.6 GPa, where long-range CDW signatures disappear from transport. In striking contrast, high-pressure, low-temperature Raman spectroscopy uncovers short-range CDW correlations that remain hidden to resistivity, emerge beyond PC, and persist up to ∼10.0 GPa, spanning the entire superconducting dome. Synchrotron X-ray diffraction detects no structural transition up to 32.4 GPa, indicating that the CDW evolution is electronic in origin. These results establish an unusual phase diagram in which superconductivity develops within a persistent short-range CDW background, offering new insight into pressure-tuned collective states in low-dimensional quantum materials.