Two-Dimensional Nature of Four-Layer Superconductors by Inequivalent Hole Distribution

Details Two-Dimensional Nature of Four-Layer Superconductors by Inequivalent Hole Distribution Two-Dimensional Nature of Four-Layer Superconductors by Inequivalent Hole Distribution

2000-10-19

arxiv.org/abs/cond-mat/0010274v1

Phys. Rev. B 63, 134513 (2001)

Physics

Condensed Matter

Superconductivity

5 pages and 4 figures

Scientific paper

10.1103/PhysRevB.63.134513

The magnetization of the four-layer superconductor CuBa_{2}Ca_{3}Cu_4O_{12-\delta} with T_c\simeq117 K is presented. The high-field magnetization around T_c(H) follows the exact two-dimensional scaling function given by Te\v{s}anovi\'{c} and Andreev. This feature is contrary to the inference that the interlayer coupling becomes strong if the number of CuO_2 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 CuO_2 layers per unit cell, g_{\rm eff}, turned out to be \simeq 2 rather than 4, which indicated that two among the four CuO_2 layers were in states far from their optimal doping levels. This result could explain why CuBa_{2}Ca_{3}Cu_4O_{12-\delta} shows two-dimensional behavior.

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