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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 | Abstract: | The 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 | Services: | Forum | Review | PDF | Favorites |
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