Inhomogeneous superconductivity induced in a weak ferromagnet

Details Inhomogeneous superconductivity induced in a weak ferromagnet Inhomogeneous superconductivity induced in a weak ferromagnet

2001-11-09

arxiv.org/abs/cond-mat/0111178v1

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures. To be publishedin Physica C (proceedings of the Second Euroconference on Vortex Matter in Superconductors,

Scientific paper

10.1016/S0921-4534(01)01263-1

Under certain conditions, the order parameter induced by a superconductor (S) in a ferromagnet (F) can be inhomogeneous and oscillating, which results e.g. in the so-called pi-coupling in S/F/S junctions. In principle, the inhomogeneous state can be induced at T_c as function of the F-layer thickness d_F in S/F bilayers and multilayers, which should result in a dip-like characteristic of T_c(d_F). We show the results of measurements on the S/F system Nb/Cu_{1-x}Ni_x, for Ni-concentrations in the range x = 0.5-0.7, where such effects might be expected. We find that the critical thickness for the occurrence of superconductivity is still relatively high, even for these weak ferromagnets. The resulting dip then is intrinsically shallow and difficult to observe, which explains the lack of a clear signature in the T_c(d_F) data.

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