Large superconducting spin valve effect and ultra-small exchange-splitting in epitaxial rare-earth-niobium trilayers
Physical Review Letters
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Gu, Y., Halász, G. B., Robinson, J., & Blamire, M. (2015). Large superconducting spin valve effect and ultra-small exchange-splitting in epitaxial rare-earth-niobium trilayers. Physical Review Letters, 115 067201. https://doi.org/10.1103/PhysRevLett.115.067201
Epitaxial Ho/Nb/Ho and Dy/Nb/Dy superconducting spin valves (SSVs) show a reversible change in the zero-field critical temperature (∆Tc0) of ~400 mK and an infinite magnetoresistance on changing the relative magnetization of the Ho or Dy layers. Unlike transition metal SSVs which show much smaller ∆Tc0 values, our results can be quantitatively modeled. However, the fits require an extraordinarily low induced exchange splitting which is dramatically lower than known values for rare-earth Fermilevel electrons implying that new models for the magnetic proximity effect may be required.
This work is partially supported by ERC AiG “Superspin”. Yuanzhou Gu acknowledges financial support from King’s College, Cambridge.
External DOI: https://doi.org/10.1103/PhysRevLett.115.067201
This record's URL: https://www.repository.cam.ac.uk/handle/1810/248876