Effect of pinning on the vortex-lattice melting line in type-II superconductors
G. P. Mikitik, E. H. Brandt
DOI 10.1103/PhysRevB.68.054509 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
The vortex-lattice melting line in three-dimensional type-II superconductors with pinning is derived by equating the free energies of the vortex system in the solid and liquid phases. We account for the elastic and pinning energies and the entropy change that originates from the disappearance of the phonon shear modes in the liquid. The pinning is assumed to be caused by point defects and to be not too strong so that the melting line lies inside the so-called bundle-pinning region. We show that the derived equation for the melting line is equivalent to some Lindemann criterion, which however differs from that used previously. Estimating the effect of pinning on the entropy jump at melting, we find the upper critical point of the melting line from the condition that this jump vanishes. We also consider the H−T phase diagrams of type-II superconductors for different strengths and types of pinning and analyze the two recently discussed scenarios how the melting line and the order-disorder line merge.
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 |
Similar papers
Magnetic-field, temperature, geometry, and angle-dependent studies of vortex pinning in vibrating high-Tc superconductor crystals
similarity 0.98A. Gupta et al.
Source status unknown — claims are unverified
Thermal fluctuations of vortex lines, pinning, and creep in high-Tc superconductors
similarity 0.98M. V. Feigel’man & V. M. Vinokur
Source status unknown — claims are unverified
Statistical variations of the elementary flux-pinning force and their effect on the shape of the bulk-pinning-force curve of high-field superconductors
similarity 0.98L. D. Cooley et al.
Source status unknown — claims are unverified
Phase diagram of vortices in high-Tc superconductors from lattice defect model with pinning
similarity 0.98Jürgen Dietel & Hagen Kleinert
Source status unknown — claims are unverified
Dynamic vortex phases and pinning in superconductors with twin boundaries
similarity 0.98C. Reichhardt et al.
Source status unknown — claims are unverified
Spatiotemporal dynamics and plastic flow of vortices in superconductors with periodic arrays of pinning sites
similarity 0.97C. Reichhardt et al.
Source status unknown — claims are unverified