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Zero Bias Conductance in d‐Wave Superconductor/Ferromagnet/d‐Wave Superconductor Trilayers
Author(s) -
Popović Zorica,
Miranović Predrag,
Zikic Radomir
Publication year - 2018
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201700554
Subject(s) - condensed matter physics , superconductivity , ferromagnetism , conductance , physics , proximity effect (electron beam lithography) , biasing , materials science , voltage , quantum mechanics , nanotechnology , layer (electronics) , resist , electron beam lithography
Zero bias conductance (ZBC) in ballistic voltage‐biased d‐wave superconductor/ferromagnet/d‐wave superconductor (DFD) junctions is studied theoretically, for various orientations of superconducting electrodes. We show that ZBC increases with exchange field h in the F barrier, up to some maximum value of h which is of the order of the pair potential in the superconducting electrodes. We find that for a given exchange field, ZBC monotonically decreases with temperature. When the exchange field h is smaller or of the order of the superconducting gap Δ, ZBC has a distinct kink at some characteristic temperature T *. It appears that for this temperature Δ( T *) = h . Thus, observing T * where the kink in the ZBC temperature dependence occurs provides a reliable measurement method to determine exchange fields of the order of the superconducting gap.