Abstract
A systematic study of flux pinning and the thermodynamic critical field ${H}_{c}$ has been undertaken to determine whether ${H}_{c}$ is a central factor determining the critical current ${J}_{c}.$ Materials that have a fairly wide temperature interval of thermodynamic reversibility are selected so that the thermodynamic critical field can be confidently extrapolated into the irreversible regime. ${J}_{c}$ is found to scale with ${H}_{c}.$ For a given sample, the ${J}_{c}{/H}_{c}$ vs ${H/H}_{c}$ curves are close to a universal function as temperature changes. In addition, the peak in the pinning force curve also scales with ${H}_{c}^{2}$ for a wide variety of samples having quite different transition temperatures.
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