Two-dimensional nature of four-layer cuprate superconductors
Mun-Seog Kim, C. U. Jung, Sung-Ik Lee, A. Iyo
DOI 10.1103/PhysRevB.63.134513 · Physical Review B
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Abstract
The magnetization of the four-layer superconductor CuBa2Ca3Cu4O12−δ with Tc≃117K is presented. The high-field magnetization around Tc(H) follows the exact two-dimensional scaling function given by Tešanović and Andreev. This feature is contrary to the inference that the interlayer coupling becomes strong if the number of CuO2 planes in a unit cell increases. Also, the fluctuation-induced susceptibility in the low-field region was analyzed by using the modified Lawrence-Doniach model. The effective number of independently fluctuating CuO2 layers per unit cell, geff, turned out to be ≃2 rather than 4, which indicated that two among the four CuO2 layers were in states far from their optimal doping levels. This result could explain why CuBa2Ca3Cu4O12−δ shows two-dimensional behavior.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| 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 |
| CuBa2Ca3Cu4O12 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 117 | Pressure not reported | unknown |
| HgBa2Ca3Cu4O10 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 125 | Pressure not reported | unknown |
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