Fig. 3: Pressure effect for La4Ni3O10 with different structures.
From: Absence of superconductivity and density-wave transition in ambient-pressure tetragonal La4Ni3O10
a Temperature dependence of resistance for monoclinic La4Ni3O10 (sample S1) under various pressure. The resistance at room temperature gradually decreases with increasing pressure. The anomaly corresponding to the possible density-wave transition is gradually suppressed, and superconductivity emerges above 20 GPa. With further increasing pressure, the superconducting transition becomes more pronounced, and the Tc continuously increases. The summarized phase diagram for density-wave and superconducting transition is show in Fig. 1e. b Enlarged area for the resistance at low temperature which shows superconductivity. Zero resistance can be achieved above 60 GPa. c Temperature dependence of resistance for tetragonal La4Ni3O10 (sample S3) up to 20.2 GPa. The resistance gradually decreases with increasing pressure below 14 GPa, then starts to increase. No anomaly related to the density-wave transition is observed. d Temperature dependence of resistance for tetragonal La4Ni3O10 (sample S3) above 20.2 GPa. The resistance at room temperature decreases with increasing pressure and shows a weak upturn at low temperatures above 20 GPa. e, f Pressure dependence of resistance at high and low temperatures for monoclinic sample S1 (e) and tetragonal sample S3 (f).
