Zero-resistance state and specific-heat anomaly at 110 K in the Y1.2Ba0.8CuO4−y superconductor

The transition to the zero-resistance state at 110 K has been observed in multiphasic samples of Y1.2Ba0.8CuO4−y nominal composition. The intrinsic nature of this high-temperature superconducting state is confirmed by the jump atT c in the specific-heat curve.