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Long-Range Spin-Triplet Superconductivity Induced by Magnetic Field in d Wave Superconductor/Ferromagnet Hybrid System

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Abstract

We theoretically study the long-range spin- triplet superconductivity in d wave superconductor/ ferromagnet/ferromagnet (S/F1/F2) trilayer junction, in which the magnetization of F1 layer could be rotated in the y–z plane by an external magnetic field. The four-component Eilenberger equations were constructed to calculate the superconducting order parameters and density of states (DOS). Near the clean limit, the p wave equal-spin triplet component could be induced when the magnetization directions of F1/F2 layers are non-collinear, and the DOS exhibits a split zero-bias conductance peak. The various parameters such as ferromagnetic exchange energy, thickness of ferromagnetic layers, and angles between F1/F2 magnetization directions are studied for the effect on inducing triplet superconductivity. By magnetic field controlling the emergence of equal-spin triplet pairings or not, such a tunable S/F1/F2 trilayer junction based on long-range spin-triplet superconductivity could be used as a superconducting switch device, which would open up a new view of spintronics.

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Acknowledgments

This work was supported by the National Natural Science Foundation of China under contract nos. 11274311 and U1232139.

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Authors and Affiliations

  1. Key Laboratory of Materials Physics, Institute of Solid State Physics, Chinese Academy of Sciences, Hefei, 230031, China

    W. Wang, D. F. Shao, R. C. **ao & W. J. Lu

  2. Modern Experiment Technology Center, Anhui University, Hefei, 230039, China

    H. Y. Wu

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  1. W. Wang
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  2. D. F. Shao
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  3. R. C. **ao
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  4. W. J. Lu
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  5. H. Y. Wu
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Correspondence to W. J. Lu or H. Y. Wu.

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Wang, W., Shao, D.F., **ao, R.C. et al. Long-Range Spin-Triplet Superconductivity Induced by Magnetic Field in d Wave Superconductor/Ferromagnet Hybrid System. J Supercond Nov Magn 29, 1741–1746 (2016). https://doi.org/10.1007/s10948-016-3482-6

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  • DOI: https://doi.org/10.1007/s10948-016-3482-6

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