Enhanced two-dimensional properties of the four-layered cuprate high-T c superconductor TlBa2Ca3Cu4O y

Kyung Hee Kim, Heon Jung Kim, Sung Ik Lee, A. Iyo, Y. Tanaka, K. Tokiwa, T. Watanabe

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Abstract

We have measured the temperature dependence of the reversible magnetization of a four-layered cuprate TlBa2Ca3Cu4O y (Tl-1234) for the H∥c axis, which has the highest superconducting transition temperature Tc of almost 130 K 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.

Original languageEnglish
Article number092501
Pages (from-to)092501-1-092501-4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume70
Issue number9
DOIs
Publication statusPublished - Sep 2004

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