Comment on “Enhanced two-dimensional properties of the four-layered cuprate high-Tc superconductor TlBa2Ca3Cu4Oy”
I. L. Landau, H. R. Ott
DOI 10.1103/PhysRevB.72.176502 · Physical Review B
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Abstract
We reanalyze published magnetization data and demonstrate that the conclusion of the original authors, claiming enhanced two-dimensional properties of the cuprate superconductor TlBa2Ca3Cu4Oy, is not supported by the experimental results. Our analysis shows that the magnetic field dependence of the mixed-state magnetization for this particular sample is amazingly close to the results of numerical calculations by Brandt for an ideal vortex lattice without fluctuations. This good agreement between experiment and theory allows for the evaluation of the absolute values of the upper critical field Hc2(T).
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. | 126.7 | Pressure not reported | unknown |
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