Triplet pairing states with equal spins
in ferromagnet/superconductor heterojunctions
for noncollinear magnetizations |
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Authors: | Z P Niu Z M Zheng D Y Xing |
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Institution: | (1) National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing, 210093, China |
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Abstract: | Four-component Bogoliubov-de Gennes equations are applied to study
tunneling conductance spectra of ferromagnet/ferromagnet/d-wave
superconductor (F1/F2/d-wave S) tunnel junctions and to find
out signs of spin-triplet pairing correlations induced in the
proximity structure. The pairing correlations with equal spins
arises from the novel Andreev reflection (AR), which requires at
least three factors: the usual AR at the F2/S interface, spin
flip in the F2 layer, and superconducting coherence kept up in
the F2 layer. Effects of angle α between magnetizations of
the two F layers, polarizations of the F1 and F2 layers, the
thickness of the F2 layer, and the orientation of the d-wave S crystal on the tunneling conductance are investigated. A conversion
from a zero-bias conductance dip at α = 0 to a zero-bias
conductance peak at a certain value of α can be seen as a
sign of generated spin-triplet correlations. |
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Keywords: | PACS" target="_blank">PACS 74 45 +c Proximity effects Andreev effect SN and SNS junctions 74 50 +r Tunneling phenomena point contacts weak links Josephson effects 72 25 -b Spin polarized transport |
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