STUDY OF FINE PECULIARITIES OF HEAT CAPACITY IN YBa2Cu3OyFILMS BY MEANS OF THE LASER-COUPLED FLAT-COIL-OSCILLATOR

Improvements in the “hybrid” imaging method, based on traditional Laser Scanning Microscopy in combination with the single-layer flat-coil-oscillator (SFCO) sensitive technique introduced by authors earlier, are discussed. This method is capable of imaging 2D-grained structure, as well as the normal-to-superconductive phase transition in flat thin high-Tc superconductive materials with 1–2 μm spatial resolution. It enabled to detect weakly expressed peculiarities of the heat capacity in YBa2Cu3Oy film (preceding the well-known specific heat “jump”), which are important for true understanding of the real nature of superconductivity phenomenon. The method uses a well-focused He-Ne laser beam as aprobing signal, and the SFCO-technique as a high-resolution sensing tool.