Anomalous vortex melting line in the two-component superconductor (Cu,C)Ba2Ca3Cu4O10+δ
A. Crisan, Y. Tanaka, A. Iyo, L. Cosereanu, K. Tokiwa, T. Watanabe
DOI 10.1103/PhysRevB.74.184517 · Physical Review B
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Abstract
Using the on-set of third-harmonic susceptibility we have measured vortex melting lines of high-pressure synthesized (Cu0.6C0.4)Ba2Ca3Cu4Oy [(Cu,C):1234] and (Cu0.5C0.5)Ba2Ca2Cu3Oy [(Cu,C):1223] with preferentially oriented crystallites and having various carrier concentrations. Vortex melting lines of all (Cu,C):1223 samples and of optimum-doped (Cu,C):1234 were very well described by the commonly accepted theory of melting lines within the two-fluid model. Overdoped (Cu,C):1234 proved to have an anomalous melting line, that was phenomenologically explained by the rather special gaps evolution, that is the significant opening of a second superconducting gap due to CuO2 outer planes at a temperature lower than the critical one, where the first superconducting gap due to inner planes opens. The experimental melting lines of overdoped (Cu,C):1234 were modelled theoretically by assuming an empirical formula for the temperature dependence of anisotropy factor.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| (Cu0.6C0.4)Ba2Ca3Cu4Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 117 | Pressure not reported | unknown |
| (Cu0.5C0.5)Ba2Ca2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 76 | Pressure not reported | unknown |
| (Cu0.5C0.5)Ba2Ca2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 115 | Pressure not reported | unknown |
| (Cu0.5C0.5)Ba2Ca2Cu3Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 121 | Pressure not reported | unknown |
| (Cu0.6C0.4)Ba2Ca3Cu4Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 118 | Pressure not reported | unknown |
| HgBa2Ca4Cu5Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 108 | Pressure not reported | unknown |
| HgBa2Ca4Cu5Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 72 | Pressure not reported | unknown |
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