First-Order Vortex-Lattice Phase Transition in (La1−xSrx)2CuO4 Single Crystals: Universal Scaling of the Transition Lines in High-Temperature Superconductors
T. Sasagawa, K. Kishio, Y. Togawa, J. Shimoyama, K. Kitazawa
DOI 10.1103/PhysRevLett.80.4297 · Physical Review Letters
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Abstract
The first-order vortex-lattice phase transition was observed in (La1−xSrx)2CuO4 single crystals ( 0.046≤x≤0.077). A scaling law, Hpt(T)[Oe]=2.85γ−2s−1(Tc/T−1), was found to universally hold for the phase transition lines not only in the present system but also in YBa2Cu3Oy and Bi2Sr2CaCu2Oy. Here γ2 and s are the anisotropy factor and the superconducting layer spacing. This remarkable scaling provides sound evidence that the first-order phase transition in high- Tc superconductors manifests itself as the vortex-lattice sublimation rather than melting.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La1.954Sr0.046CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25.6 | Pressure not reported | midpoint |
| La1.932Sr0.068CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 34.9 | Pressure not reported | midpoint |
| La1.923Sr0.077CuO4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 36.6 | Pressure not reported | midpoint |
| YBa2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 92.9 | Pressure not reported | unknown |
| Bi2Sr2CaCu2Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 78.3 | Pressure not reported | unknown |
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