Manifestation of room-temperature superconductivity in thin films fabricated of YBa2Cu3O7–δ

Abstract

Abstract We present manifestations of room temperature superconductivity in thin films fabricated of YBa2Cu3O7–δ (YBCO) on the substrate of NdGaO3 (110). We show that the static magnetic susceptibility measurements demonstrate the Meissner effect in weak magnetic fields at room temperature. In addition, the oscillations of the magnetic susceptibility are revealed in external magnetic field, which can be interpreted as the quantization of magnetic flux through inclusions, with superconducting domains around them and the observation of the field-dependent steps that seem to be of evidence the second-order phase transition of domains. The results obtained are in a good agreement with the data of tunneling I-V curves. Finally, we suggest few further experiments that could confirm our hypothesis.