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Inverse magnetic proximity effects in superconducting In-Ni and Sn-Ni nanoparticle assemblies

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Abstract

We report on experimental evidence of non-s-wave pairing in In and Sn nanoparticle assemblies. The superconducting transition temperature T C of the In and Sn nanoparticles varies noticeably with the particle diameter. Surprisingly, T C shifts to a noticeably higher temperature when magnetic Ni nanoparticles are introduced into the vicinity of the superconducting nanoparticles. The T C increases further when the magnetic Ni nanoparticles are brought even closer to the superconducting nanoparticles. There is a critical Ni composition and a critical spatial separation between the magnetic and superconducting nanoparticles that must be reached before their magnetic proximity will suppress the superconductivity. A qualitative mechanism is proposed to understand the present observations.

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Acknowledgments

This work was supported by the National Science Council of Taiwan under Grant No. NSC 101-2112-M-008-016-MY3

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Authors and Affiliations

  1. Department of Physics, National Central University, Jhongli, 32001, Taiwan, ROC

    Chun-Ming Wu, Sunil K. Karna, Shih-Bin Liu, Chi-Hung Lee, Chin-Wei Wang & Wen-Hsien Li

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  1. Chun-Ming Wu
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  2. Sunil K. Karna
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  3. Shih-Bin Liu
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  4. Chi-Hung Lee
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  5. Chin-Wei Wang
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  6. Wen-Hsien Li
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Correspondence to Wen-Hsien Li.

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Wu, CM., Karna, S.K., Liu, SB. et al. Inverse magnetic proximity effects in superconducting In-Ni and Sn-Ni nanoparticle assemblies. J Nanopart Res 15, 1691 (2013). https://doi.org/10.1007/s11051-013-1691-5

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