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A low-power stable tunnel diode oscillator with non-traditional single-layerflat pick-up coil is an excellent MHz-range instrument with which one may studyweakly expressed peculiarities of the superconductive (SC) state in tinyplate-like high-Tc superconductive (HTSC) materials. It enables to detectchanges about 1 pH of the HTSC film's magnetic inductance (changes about 1Angstrom of the SC-magnetic penetration depth, lambda) with about 6 ordersrelative resolution. Due to detecting coil's flat design, relatively lowoperation frequency, so high relative resolution and an ability of thistechnique to operate also in high magnetic fields the method has advantagesover others. They become crucial at non-destructive studies in thin flat HTSCmaterials with small signals - especially near the normal-to-superconductive(N/S) phase transition (at start of formation of electron-pairs). Just due tosuch advantages a fine 'paramagnetic' peculiarity of the SC-transition wasdetected by this method in YBaCuO film recently, which precedes well-knownMeissner expel. The method enabled to detect also a little absorption of apower by the HTSC film upon its SC transition, with a peak located after theonset of Meissner push-out - close to its center. Extracted from so complicatedfluctuation region these subtle effects (1-st is precursor, whereas the 2-nd -posterior to the Meissner expel) indicate an existence of 3 distinctivetemperatures at N/S transition. Crucial role of these specific temperatures forunderstanding of a real nature of the whole SC-phenomenon is discussed.Possible relation between these temperatures and the 'singlet'/'triplet'behavior of electron-pairs is pointed out and argued.

Three distinctive temperatures of normal-to-superconductive phase  transition detected by the unique SFCO method: their crucial role for proper  identification of the nature of superconductivity