Finite-size effects and anisotropic melting of the vortex solid in high-temperature superconductors
N.-C. Yeh
DOI 10.1103/PhysRevB.42.4850 · Physical Review B
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Abstract
A mean-field model of anisotropic melting of the vortex solid in high-temperature superconductors is proposed. For a slab sample with dimensions lab≫lc, where 2lab and 2lc are the average diameter of the ab plane and the c axis thickness, respectively, large thermal fluctuations and finite-size effects may result in anisotropic two-dimensional melting at crossover temperatures TX(H) below the three-dimensional-melting transition TM(H). Thus a quasi-two-dimensionally ordered vortex-liquid phase may exist in TX(H) <T<TM(H). Generally, TX(H) decreases with the decreasing sample thickness, increasing magnetic field, and larger Ginzburg-Landau parameter κ(==λ/ξ). In the limit of 1/2Hc2≪H<Hc2, the geometric anisotropy plays a more important role in determining TX(H) than the electronic-mass anisotropy.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YBa2Cu3O7 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 93 | Pressure not reported | unknown |
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