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Sputter-Deposited Films of Perovskite Compound and Nb–Si–O System

One of the authors of this manuscript has reported a resistance anomaly of very thin Nb–Si films. The anomaly is marked by a sudden drop in the resistance by a factor of ∼103 at a temperature (TD) ∼180K. This behavior bears many resemblance to that of a superconductor. It became apparent to us that the presence of oxygen during sputtering remarkably improved the stable yield of the films with this anomaly and the highest TD obtained is ∼250K. These might be attributable to that in the ceramic superconductor.