Vibrating-reed experiments on superconducting suspensions
Jürgen Kober, Anurag Gupta, Pablo Esquinazi, Hans F. Braun, Ernst Helmut Brandt
DOI 10.1103/PhysRevLett.66.2507 · Physical Review Letters
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Abstract
The frequency of a vibrating reed made of a superconducting suspension of isolated micrometer-size grains of low- and high-Tc superconductors in a magnetic field directly measures the elastic pinning force on the flux line. Four different types of field and temperature dependences of the attenuation caused by moving flux lines are observed and explained. In particular, the shift to lower temperatures of the dissipation peak of small high-Tc grains perfectly agrees with the prediction by thermally activated depinning.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb66Ti34 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure not reported | unknown |
| Bi1.5Pb0.5Sr2CaCu2Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 70 | Pressure not reported | unknown |
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