Enhanced two-dimensional properties of the four-layered cuprate high-Tc superconductor TlBa2Ca3Cu4Oy
Kyung-Hee Kim, Heon-Jung Kim, Sung-Ik Lee, A. Iyo, Y. Tanaka, K. Tokiwa, T. Watanabe
DOI 10.1103/PhysRevB.70.092501 · Physical Review B
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Abstract
We have measured the temperature dependence of the reversible magnetization of a four-layered cuprate TlBa2Ca3Cu4Oy (Tl-1234) for the H‖c axis, which has the highest superconducting transition temperature Tc of almost 130K among the four-layered cuprates. The reversible magnetization was analyzed by using the high-field scaling theory and the Hao-Clem model. It was found that in the critical region around Tc, two-dimensional fluctuations dominate. This enhanced 2D behavior can be naturally explained by selective doping model, where doping levels of the inner and outer CuO2 planes in a unit cell are different. From these analyses, various thermodynamic parameters, such as the coherence length, the penetration depth, the critical fields, and the Ginzburg-Landau parameter were obtained.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| TlBa2Ca3Cu4Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 128 | Pressure not reported | unknown |
| HgBa2Ca3Cu4O10+δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 125 | Pressure not reported | unknown |
| CuBa2Ca3Cu4O12-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 117 | Pressure not reported | unknown |
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