Journal
PHYSICAL REVIEW LETTERS
Volume 115, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.115.067201
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Funding
- ERC AIG 'Superspin'
- King's College, Cambridge
- Leverhulme Trust [IN-2013-033]
- Royal Society
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Epitaxial Ho/Nb/Ho and Dy/Nb/Dy superconducting spin valves show a reversible change in the zero-field critical temperature (Delta T-c0) of similar to 400 mK and an infinite magnetoresistance on changing the relative magnetization of the Ho or Dy layers. Unlike transition-metal superconducting spin valves, which show much smaller Delta T-c0 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 Fermi-level electrons, implying that new models for the magnetic proximity effect may be required.
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