Phase inhomogeneity and scaling in ferromagnet-unconventional superconductor-ferromagnet double tunnel junctions
Biao Jin, Gang Su, Qing-Rong Zheng, Masuo Suzuki
DOI 10.1103/PhysRevB.68.144504 · Physical Review B
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Abstract
Spin-dependent transport in ferromagnet-unconventional superconductor-ferromagnet double tunnel junctions is investigated. It is shown that the spin accumulation can induce the phase inhomogeneity in the central superconductor at lower temperatures when the magnetizations of both ferromagnet electrodes are antiparallel. A scaling behavior for the critical voltage where superconductivity is suppressed is uncovered for four different gap symmetries (i.e., s, dx2−y2, dx2−y2+iɛs, and dx2−y2+iɛdxy waves, with ɛ the mixing parameter among different orbitals). It is found that the gap symmetry of the central superconductor does not alter qualitatively the spintronic transport property of the tunnel junction although there are quantitative changes.
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