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    Josephson effect in spin-singlet superconductor/ferromagnetic insulator/spin-triplet superconductor junctions with helical pp-wave states

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    We study the Josephson effect in spin-singlet superconductor/helical pp-wave superconductor junctions with a ferromagnetic barrier using the quasiclassical Green function method. It is found that both sinϕ\sin{\phi}-type and cosϕ\cos{\phi}-type current-phase relations always exist, irrespective of the gap symmetries in superconductors. The indispensable condition for the sinϕ\sin{\phi}-type and cosϕ\cos{\phi}-type current is that the magnetization must have a component parallel to the crystallographic aa or bb axis, which is distinct from the case of pp-wave superconductor described by a \vect{d}-vector with a uniform direction. The relation between the condition and the symmetries of the gap functions is analysed. We investigate in detail the symmetries and the sign reversal of the Josephson current when the magnetization is rotated.Comment: 9 pages,7 figure

    2-(4-tert-Butyl­phen­yl)-5-p-tolyl-1,3,4-oxadiazole

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    In the title compound, C19H20N2O, the dihedral angles between the 1,3,4-oxadiazole ring and the pendant 4-tert-butyl­phenyl and 4-methyl­phenyl rings are 12.53 (17) and 2.14 (17)°, respectively. In the crystal, mol­ecules are linked by C—H⋯N hydrogen bonds, forming chains
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