Unaltered density wave transition and pressure-induced signature of superconductivity in Nd-doped La3Ni2O7

The recent discovery of superconductivity in the bilayer nickelate ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$ under high pressure has garnered significant interest due to its high transition temperature surpassing the liquid nitrogen limit. This breakthrough has prompted an extensive amount of research aimed at identifying new superconducting nickelates and elucidating the underlying mechanism responsible for superconductivity in ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$. Here we report our findings on the effect of Nd doping in ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$. Electrical transport measurements conducted at ambient pressure reveal that as the Nd doping concentration increases, ${\mathrm{La}}_{3\ensuremath{-}x}{\mathrm{Nd}}_{x}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$ (with $x=0$, 0.3, 0.6, 0.9) samples transition from a bad metal to a semiconductor. However, the density wave transition temperature remains unaffected across all ${\mathrm{La}}_{3\ensuremath{-}x}{\mathrm{Nd}}_{x}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$ samples. Magnetic property investigations indicate that all doped samples exhibit paramagnetic behavior. Furthermore, we performed resistance measurements under high pressure on the undoped and doped samples. All the samples show a signature of superconductivity at about 80 K under pressure. Our observations extend the scope of doping studies in ${\mathrm{La}}_{3}{\mathrm{Ni}}_{2}{\mathrm{O}}_{7}$, which will aid in the exploration of the superconducting mechanism within this promising nickelate compound.