Reentrant superconductivity in Nb/Cu1-xNix bilayers.
We report on the first observation of a pronounced reentrant superconductivity phenomenon in a superconductor/ferromagnet layered system. The results were obtained using a superconductor/ferromagnetic-alloy bilayer of Nb/Cu(1-x)Ni(x). The superconducting transition temperature T(c) drops sharply with increasing thickness dCuNi) of the ferromagnetic layer, until complete suppression of superconductivity is observed at d(CuNi) approximately equal to 4 nm. Increasing the Cu(1-x)Ni(x) layer thickness further, superconductivity reappears at d(CuNi) > or =13 nm. Our experiments give evidence for the pairing function oscillations associated with a realization of the quasi-one-dimensional Fulde-Ferrell-Larkin-Ovchinnikov-like state in the ferromagnetic layer.
Zdravkov
V
V
Institute of Applied Physics, LISES ASM, Kishinev 2028, Moldova.
Sidorenko
A
A
Obermeier
G
G
Gsell
S
S
Schreck
M
M
Müller
C
C
Horn
S
S
Tidecks
R
R
Tagirov
L R
LR