Influence of magnetic impurities on charge transport in diffusive-normal-metal/superconductor junctions

Yokoyama, T. and Tanaka, Y. and Golubov, A.A. and Inoue, J. and Asano, Y. (2005) Influence of magnetic impurities on charge transport in diffusive-normal-metal/superconductor junctions. Physical Review B: Condensed matter and materials physics, 71 (9). 094506. ISSN 1098-0121

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Abstract:	Charge transport in the diffusive normal metal (DN)/insulator/s- and d-wave superconductor junctions is studied in the presence of magnetic impurities in DN in the framework of the quasiclassical Usadel equations with the generalized boundary conditions. The cases of s- and d-wave superconducting electrodes are considered. The junction conductance is calculated as a function of a bias voltage for various parameters of the DN metal, resistivity, Thouless energy, the magnetic impurity scattering rate, and the transparency of the insulating barrier between DN and a superconductor. It is shown that the proximity effect is suppressed by magnetic impurity scattering in DN for any value of the barrier transparency. In low-transparent s-wave junctions this leads to the suppression of the normalized zero-bias conductance. In contrast to that, in high transparent junctions zero-bias conductance is enhanced by magnetic impurity scattering. The physical origin of this effect is discussed. For the d-wave junctions, the dependence on the misorientation angle alpha between the interface normal and the crystal axis of a superconductor is studied. The zero-bias conductance peak is suppressed by the magnetic impurity scattering only for low transparent junctions with alpha~0. In other cases the conductance of the d-wave junctions does not depend on the magnetic impurity scattering due to strong suppression of the proximity effect by the midgap Andreev resonant states.
Item Type:	Article
Copyright:	© 2005 The American Physical Society
Faculty:	Science and Technology (TNW)
Research Group:	Low Temperatures - Biomagnetism (LT)
Link to this item:	http://purl.utwente.nl/publications/52959
Official URL:	http://dx.doi.org/10.1103/PhysRevB.71.094506
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