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29 March 2024
 
  » arxiv » 1202.5219

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Impurity-assisted Andreev reflection at a spin-active half-metal-superconductor interface
Francis B. Wilken ; Piet W. Brouwer ;
Date 23 Feb 2012
AbstractThe Andreev reflection amplitude at a clean interface between a half-metallic ferromagnet (H) and a superconductor (S) for which the half metal’s magnetization has a gradient perpendicular to the interface is proportional to the excitation energy $varepsilon$ and vanishes at $varepsilon=0$ [B’{e}ri {em et al.}, Phys. Rev. B {f 79}, 024517 (2009)]. Here we show that the presence of impurities at or in the immediate vicinity of the HS interface leads to a finite Andreev reflection amplitude at $varepsilon=0$. This impurity-assisted Andreev reflection dominates the low-bias conductance of a HS junction and the Josephson current of an SHS junction in the long-junction limit.
Source arXiv, 1202.5219
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