Impurity-assisted Andreev reflection at a spin-active half metal-superconductor interface
Francis B. Wilken, Piet W. Brouwer
DOI 10.1103/PhysRevB.85.134531 · Physical Review B
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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 ɛ and vanishes at ɛ=0 [Béri et al., Phys. Rev. B 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 ɛ=0. This impurity-assisted Andreev reflection dominates the low-bias conductance of an HS junction and the Josephson current of an SHS junction in the long-junction limit.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CrO2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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