- Conference date: 7-13 Jan 1999
- Location: Coral Gables, Florida (USA)
One of the important problems of high-temperature superconductivity is to understand and ultimately to control fluxoid motion. We will describe a new technique for measuring the pressure dependence of in a diamond anvil cell by the third harmonic of the ac susceptibility. It requires no background subtraction and allows the use of gasket materials made from hardened steels. More significantly, the third harmonic indicates the onset of irreversible (with respect to changes in applied magnetic field) flux motion. Thus we are able to simultaneously apply high (up to 10 GPa) pressures and high (up to 10 T) magnetic fields to study the effect of changes in interplanar coupling on the motion of flux. In other reported studies, the interplanar coupling has been adjusted by chemical doping which introduces defects (or pinning sites). By contrast, we can directly change the interplanar spacing without introducing defects. Thus, the effects of coupling can be separated from those of pinning. We will present results which show significant pressure induced shifts in the irreversibility line in and
- High pressure
- Magnetic fields
- Alternating current power transmission
- Diamond anvil cells
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