Two-dimensional nature of four-layer cuprate superconductors

Article

关键词: REVERSIBLE MAGNETIZATION;    THERMODYNAMIC PARAMETERS;    VORTEX FLUCTUATIONS;    OXYGEN-CONTENT;    TEMPERATURE;    MODEL;    BEHAVIOR;    HC2;   

DOI  :  10.1103/PhysRevB.63.134513

来源: SCIE

【 摘 要 】

The magnetization of the four-layer superconductor CuBa2Ca3Cu4O12-delta with T(c)similar or equal to 117 K is presented. The high-field magnetization around T-c(H) follows the exact two-dimensional scaling function given by Tesanovic 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-held region was analyzed by using the modified Lawrence-Doniach model. The effective number of independently fluctuating CuO2 layers pel unit cell, g(eff), turned out to be similar or equal to 2 rather than 4, which indicated that two among the four CuO2 layers were in stales far from their optimal doping levels. This result could explain why CuBa2Ca3Cu4O12-delta shows two-dimensional behavior.

【 授权许可】

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