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Superconducting properties of Ba2Ca7Cu8O16(O0.8+δ F1.2) studied via reversible magnetization

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Abstract

The Ba2Ca7Cu8O16(O0.8+δ F1.2) (F-0278) superconductor with 8 CuO2 planes in the structural unit was investigated by analyzing the reversible magnetization based on the Hao-Clem model and fluctuation theories. In spite of the superconducting block (SCB) being thicker than the charge reservoir block (CRB), the analysis clearly revealed two-dimensional (2D) superconducting properties in F-0278, such as a strong temperature dependence of the Ginzburg parameter κ and a relatively short effective interlayer distance. The extreme 2D behavior can be understood in terms of the significant charge imbalance in the SCB, which was previously proposed to exist in F-0278, where the carriers are distributed quite unequally to crystallographically different CuO2 planes; i.e., the outer planes (OPs) adjacent to the CRB always contain more carriers than the inner planes (IPs). The 2D nature of F-0278 indicates a significant or complete suppression of the superconductivity in the IPs. The important superconducting parameters were also obtained from the analysis.

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Authors and Affiliations

  1. Department of Physics, Pusan National University, Busan, 609-735, Korea

    Yong-Tae Kwon & Young Cheol Kim

  2. Department of Physics, College of Natural Science, Daegu University, Gyeongsan, 712-714, Korea

    Heon-Jung Kim

  3. National Institute of Advanced Industrial Science and Technology (AIST), Ibaraki, 305-8568, Japan

    Akira Iyo & Parasharam M. Shirage

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  1. Yong-Tae Kwon
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  2. Young Cheol Kim
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  3. Heon-Jung Kim
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  4. Akira Iyo
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  5. Parasharam M. Shirage
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Correspondence to Heon-Jung Kim.

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Kwon, YT., Kim, Y.C., Kim, HJ. et al. Superconducting properties of Ba2Ca7Cu8O16(O0.8+δ F1.2) studied via reversible magnetization. Journal of the Korean Physical Society 61, 1802–1806 (2012). https://doi.org/10.3938/jkps.61.1802

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  • DOI: https://doi.org/10.3938/jkps.61.1802

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