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Interplay of ferromagnetism and triplet superconductivity in a Josephson junction

Brydon, P. and Kastening, Boris and Morr, Dirk and Manske, Dirk (2008):
Interplay of ferromagnetism and triplet superconductivity in a Josephson junction.
In: Physical Review B, American Physical Society, pp. 104504-1, 77, (10), ISSN 1098-0121, [Online-Edition: http://dx.doi.org/10.1103/PhysRevB.77.104504],
[Article]

Abstract

In this work we extend our earlier analysis of the novel Josephson effect in triplet superconductorferromagnet- triplet superconductor �TFT� junctions [�Kastening et al., Phys. Rev. Lett. 96, 047009 (�2006)]��. In our more general formulation of the TFT junction, we allow for potential scattering at the barrier and an arbitrary orientation of the ferromagnetic moment. Several new effects are found upon the inclusion of these extra terms: for example, we find that a Josephson current can flow even when there is vanishing phase difference between the superconducting condensates on either side of the barrier. The critical current for a barrier with magnetization parallel to the interface is calculated as a function of the junction parameters, and is found to display strong nonanalyticities. Furthermore, the Josephson current switches identified in our previous work are found to be robust features of the junction, while the unconventional temperature dependence of the current is very sensitive to the extra terms in the barrier Hamiltonian.

Item Type: Article
Erschienen: 2008
Creators: Brydon, P. and Kastening, Boris and Morr, Dirk and Manske, Dirk
Title: Interplay of ferromagnetism and triplet superconductivity in a Josephson junction
Language: English
Abstract:

In this work we extend our earlier analysis of the novel Josephson effect in triplet superconductorferromagnet- triplet superconductor �TFT� junctions [�Kastening et al., Phys. Rev. Lett. 96, 047009 (�2006)]��. In our more general formulation of the TFT junction, we allow for potential scattering at the barrier and an arbitrary orientation of the ferromagnetic moment. Several new effects are found upon the inclusion of these extra terms: for example, we find that a Josephson current can flow even when there is vanishing phase difference between the superconducting condensates on either side of the barrier. The critical current for a barrier with magnetization parallel to the interface is calculated as a function of the junction parameters, and is found to display strong nonanalyticities. Furthermore, the Josephson current switches identified in our previous work are found to be robust features of the junction, while the unconventional temperature dependence of the current is very sensitive to the extra terms in the barrier Hamiltonian.

Journal or Publication Title: Physical Review B
Volume: 77
Number: 10
Publisher: American Physical Society
Divisions: 11 Department of Materials and Earth Sciences > Material Science > Advanced Thin Film Technology
11 Department of Materials and Earth Sciences > Material Science
11 Department of Materials and Earth Sciences
Date Deposited: 09 Jan 2013 09:15
Official URL: http://dx.doi.org/10.1103/PhysRevB.77.104504
Identification Number: doi:10.1103/PhysRevB.77.104504
Funders: B.K. acknowledges support by DLR �German Aerospace Center�., D.K.M. acknowledges financial support by the Alexander von Humboldt Foundation, the National Science Foundation under Grant No. DMR-0513415, and the U.S. Department of Energy under Grant No. DE-FG02- 05ER46225.
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