Suppression of intertwined density waves in La4Ni3-xCuxO10+δ

Superconductivity in La4Ni3O10 has been reported to emerge upon suppression of intertwined spin and charge density wave (SDW/CDW) order, suggesting a possible connection to the pairing mechanism. Here we report a systematic investigation of La4 Ni3−xCux O10+δ ($$0\le x\le 0.7$$), focusing on the evolution of the SDW/CDW order as a function of chemical substitution. Temperature-dependent resistivity, magnetic susceptibility, and Hall effect measurements reveal a linear suppression of density wave transition temperature Tdw and a concurrent enhancement of hole concentration with increasing Cu content. At higher substitution levels ($$x > 0.15$$), the transition induced anomaly in the resistivity becomes undetectable while a magnetic signature persists, indicating a partial decoupling of spin and charge components and the possible survival of short-range spin correlations. The absence of superconductivity across the substitution series highlights the importance of additional factors in stabilizing the superconducting state in pressurized La4Ni3O10.