A spin triplet supercurrent through the half-metallic ferromagnet CrO2

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2006
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Keizer, Ruurd S.
Klapwijk, Teun M.
Miao, Guoxing
Xiao, Gang
Gupta, Arunava
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In general, conventional superconductivity should not occur in a ferromagnet, though it has been seen in iron under pressure. Moreover, theory predicts that the current is always carried by pairs of electrons in a spin singlet state, so conventional superconductivity decays very rapidly when in contact with a ferromagnet, which normally prohibits the existence of singlet pairs. It has been predicted that this rapid spatial decay would not occur if spin triplet superconductivity could be induced in the ferromagnet. Here we report a Josephson supercurrent through the strong ferromagnet CrO2, from which we infer that it is a spin triplet supercurrent. Our experimental set-up is different from those envisaged in the earlier predictions, but we conclude that the underlying physical explanation for our result is a conversion from spin singlet pairs to spin triplets at the interface. The supercurrent can be switched with the direction of the magnetization, analogous to spin valve transistors, and therefore could enable magnetization-controlled Josephson junctions.

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ISO 690KEIZER, Ruurd S., Sebastian T. B. GOENNENWEIN, Teun M. KLAPWIJK, Guoxing MIAO, Gang XIAO, Arunava GUPTA, 2006. A spin triplet supercurrent through the half-metallic ferromagnet CrO2. In: Nature. Springer Nature. 2006, 439(7078), pp. 825-827. ISSN 0028-0836. eISSN 1476-4687. Available under: doi: 10.1038/nature04499
BibTex
@article{Keizer2006-02-16tripl-52524,
  year={2006},
  doi={10.1038/nature04499},
  title={A spin triplet supercurrent through the half-metallic ferromagnet CrO<sub>2</sub>},
  number={7078},
  volume={439},
  issn={0028-0836},
  journal={Nature},
  pages={825--827},
  author={Keizer, Ruurd S. and Goennenwein, Sebastian T. B. and Klapwijk, Teun M. and Miao, Guoxing and Xiao, Gang and Gupta, Arunava}
}
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    <dcterms:abstract xml:lang="eng">In general, conventional superconductivity should not occur in a ferromagnet, though it has been seen in iron under pressure. Moreover, theory predicts that the current is always carried by pairs of electrons in a spin singlet state, so conventional superconductivity decays very rapidly when in contact with a ferromagnet, which normally prohibits the existence of singlet pairs. It has been predicted that this rapid spatial decay would not occur if spin triplet superconductivity could be induced in the ferromagnet. Here we report a Josephson supercurrent through the strong ferromagnet CrO&lt;sub&gt;2&lt;/sub&gt;, from which we infer that it is a spin triplet supercurrent. Our experimental set-up is different from those envisaged in the earlier predictions, but we conclude that the underlying physical explanation for our result is a conversion from spin singlet pairs to spin triplets at the interface. The supercurrent can be switched with the direction of the magnetization, analogous to spin valve transistors, and therefore could enable magnetization-controlled Josephson junctions.</dcterms:abstract>
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