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Paramagnetic Meissner Effect at High Fields in Y1−x Ca x Ba2Cu3O7−δ (x = 0.05, 0.125, 0.2) films

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Abstract

We report on systematic field-cooled magnetization experiments on three different Y1−x Ca x Ba2Cu3O7−δ (x = 0.05, 0.125, 0.2) film samples. The samples are made by pulsed laser deposition (PLD) method. Magnetic fields ranging from 0.02 T up to 5 T are applied and a paramagnetic response related to the superconducting state is observed when a strong field is applied parallel to the Cu–O plane. The magnitude of the high field paramagnetic moment (HFPME) increases as the field is increased. For x < 0.2 the paramagnetic moment increases with x. However, for x>0.2, the paramagnetic moment abruptly decreases. We discuss our results in terms of the flux compression scenario in the sample modulated by Ca concentration.

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Acknowledgments

The research was supported by Ministry Science and Technology of the People’s Republic of China (2016YFB0700504), the Shanghai Pujiang Program (13PJD015), Science & Technology commission of Shanghai Municipality (13ZR1415200, 13JC1402400, 11dz1100305), National Natural Science Foundation of China (NSFC, No. 51372149, 51371111, 61571280). Partly Supported by Shanghai Key Laboratory of High Temperature Superconductors (No. 14DZ2260700).

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Authors and Affiliations

  1. Department of Physics, Shanghai University, Shanghai, 200444, China

    Qing Li, Zhenjie Feng, Chuan Yu, Xunqing Yin, Yiming Cao, Chao Jing, Dongmei Deng & Shixun Cao

  2. Materials Genome Institute, Shanghai University, Shanghai, 200444, China

    Zhenjie Feng, Shixun Cao & Jincang Zhang

  3. Shanghai Key Laboratory of High Temperature Superconductors, Shanghai, 200444, China

    Zhenjie Feng & Shixun Cao

  4. Department of Applied Physics, California Institute of Technology, Pasadena, CA, 91125, USA

    Hao Chu

  5. Laboratory for Microstructures, Shanghai University, Shanghai, 200444, China

    Bo Lu

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  1. Qing Li
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Correspondence to Zhenjie Feng.

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Li, Q., Feng, Z., Yu, C. et al. Paramagnetic Meissner Effect at High Fields in Y1−x Ca x Ba2Cu3O7−δ (x = 0.05, 0.125, 0.2) films. J Supercond Nov Magn 30, 293–295 (2017). https://doi.org/10.1007/s10948-016-3705-x

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