Free-energy surfaces for superconducting Y1Ba2Cu3 O7
K. S. Athreya, O. B. Hyun, J. E. Ostenson, J. R. Clem, D. K. Finnemore
DOI 10.1103/PhysRevB.38.11846 · Physical Review B
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Abstract
Magnetization studies were undertaken to determine the change in free energy of the superconducting state of Y1Ba2Cu3 O7 with changes in magnetic field and temperature. Close to the transition temperature Tc magnetic flux moves easily and reversibly in these materials so that magnetization is a thermodynamically reversible variable. Hence, the free-energy surfaces can be measured and quantities such as entropy and specific heat can be derived. Magnetization is found to be linear in (Tc−T)2 near Tc. The free-energy surface shows substantial changes with magnetic field all the way up to 92 K, well outside the usual Hc2 vs T plots derived from resistivity or ac susceptibility data.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Y1Ba2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92 | Pressure not reported | onset |
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