Phase diagram of vortices in high-Tc superconductors with a melting line in the deep Hc2 region
Jürgen Dietel, Hagen Kleinert
DOI 10.1103/PhysRevB.79.014512 · Physical Review B
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Abstract
We use a simple elastic Hamiltonian for the vortex lattice in a weak impurity background, which includes defects in the form of integer-valued fields to calculate the free energy of a vortex lattice in the deep Hc2 region. The phase diagram in this regime is obtained by applying the variational approach of Mézard and Parisi developed for random manifolds. We find a first-order line between the Bragg-glass and vortex-glass phases as a continuation of the melting line. In the liquid phase, we obtain an almost vertical third-order glass transition line near the critical temperature in the H−T plane. Furthermore, we find an almost vertical second-order phase transition line in the Bragg-glass as well as the vortex-glass phases, which crosses the first-order Bragg-glass–vortex-glass transition line. We calculate the jump of the temperature derivate of the induction field across this second-order line as well as the entropy and magnetic-field jumps across the first-order line.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| Bi2Sr2CaCu2O8 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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