Average kinetic energy of the superconducting state
Mauro M. Doria, S. Salem-Sugui, Jr., I. G. de Oliveira, L. Ghivelder, E. H. Brandt
DOI 10.1103/PhysRevB.65.144509 · Physical Review B
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Abstract
Isothermal magnetization curves are plotted as the magnetization times the magnetic induction, 4πM⋅B, versus the applied field H. We show here that this curve is the average kinetic energy of the superconducting state versus the applied field, for type-II superconductors with a high Ginzburg-Landau parameter κ. The maximum of 4πM⋅B occurs at a field H*, directly related to the upper critical field Hc2, suggesting that Hc2(T) may be extracted from such plots even in cases when it is too high for direct measurement. We obtain these plots both theoretically, from the Ginzburg-Landau theory, and experimentally, using a Niobium sample with Tc=8.5K, and compare them.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.5 | Pressure not reported | unknown |
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