Flat coil-based tunnel diode oscillator enabling to detect the real shape of the superconductive transition curve and capable of imaging the properties of HTSC films with high spatial resolution

Possible nodal superconducting gap in Fe1+y(Te1−xSeDiaconu1, Martin2, Hu3 et al. 2013Phys. Rev. B8140View full textAdd to dashboardCite

“…Typical TDO experiments use solenoid shape inductors however, for slab shaped specimens, the low filling factor can result in low resolution of the measurements. A more intuitive approach towards increasing the sensitivity is making use of planar inductors to probe plate like samples 24,25 . However, the complicated field distribution of a single planar coil makes difficult to extract quantitative information.…”

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“…Besides, due to flat shape, even a little shift of the position of a normal-conducting plate, placed near the coil, may www.intechopen.com lead to strong distortion of the field distribution around the coil. These features, and the stability of TD-oscillators (F stability 1-10Hz, F/F10  7 -10  6  depending on the model & temperature  see [2,[11][12]) enabled us to reach 6 orders relative resolution in SFCO technique [3][4], permitting to effectively use it in a basic research [5][6][7][8], as well as in some modern technical applications [9][10]. In the last case, frequency of the oscillator is mainly used as a testing parameter, and the measuring effect is determined by a distortion of the MHz-range testing field configuration near the coil face by the vibrating copper plate, leading to the magnetic inductance changes of the coil, with a resolution  1-10pH (depending on operation temperature of a technique), resulting in the changes of test oscillator frequency.…”

“…ment of the resolution of measurements by 3-4 orders of magnitude (especially, in studies of thin, plate-like HTS materials [1,[3][4][5][6][7][8]). For comparison, typical values of the filling factor for solenoid coils are 10  4 10  3 for the said samples.…”