Physics
Scientific paper
Feb 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aipc..605..123g&link_type=abstract
LOW TEMPERATURE DETECTORS: Ninth International Workshop on Low Temperature Detectors. AIP Conference Proceedings, Volume 605, p
Physics
Superconducting Device Characterization, Design, And Modeling
Scientific paper
A flat coil-based tunnel diode (TD) oscillator is a fine instrument for high-resolution measurements of the penetration depth, λ, of a MHz-range field and for the detection of small power absorption inside flat high-Tc superconductors (HTS). The method is based on detection of changes in the inductance and Q-factor value of a single-layer flat coil, which leads to frequency and/or amplitude changes of the oscillator. It enables detection of ~1 pH changes in film inductance (changes ~1 Å of λ) with ~10-6 relative resolution. It also detects ~1 nW changes in the power absorbed by a film, due to vortex motion. It operates in magnetic fields, measures in wide dynamic ranges of testing parameters, and is sensitive especially near Tc. These allow fine details of the normal-to-superconductive (N/S) transition and flux flow in a flat HTS at start of the formation of Cooper pairs to be revealed. A new paramagnetic peculiarity of the N/S transition in YBaCuO films, which precedes the well-known diamagnetic repulsion, is detected. An anomalous absorption by a film close to the end of its magnetic transition is revealed. Simultaneous frequency and amplitude tests also enabled correction of the vortex magnetic phase diagram for a very small-volume, untwinned, plate-like YBaCuO crystal. The method enables all of these measurements near Tc, without disturbing the sample, in a simple test. These results suggest a range of possibilities for use of this technique in high-resolution research work. .
Gevorgyan Samvel G.
Gevorgyan Vardan S.
Harayama Tomohiro
Inoue Masayoshi
Kiss Takanobu
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