Reliable, with one-point correction of energy scale
Comment:
Mixture of SrCO3 and CuO was annealed in air (T = 1223 K time = 16 h), in dry N2 (T = 483 K) and subjected to a flowing F2/N2 atmosphere for 15 min. The resulting sample was annealed in N2 atmosphere (T = 603 K, time = ~3 h). Tc = 46 K.