Extended Data Fig. 3: Oxygen loss.
From: Ambient-pressure superconductivity onset above 40 K in (La,Pr)3Ni2O7 films
a, Resistance changes as functions of time, with sample maintained at vacuum and different temperature inside the quantum design physical property measurement system (PPMS). b, An Arrhenius fit yields an activation energy of 0.34 eV for the oxygen loss process. c, XRD of the same sample shown in Figs. 1 and 2 in the main text after post-annealing and after 6 h in ultrahigh vacuum and 6 days in 1 atm O2 and at ambient temperature. Resistance increase rate in 1 atm O2 at ambient temperature is approximately 2 Ω per hour.
