Re-entrant superconductivity in Nb/Cu(1-x)Ni(x) bilayers
V. Zdravkov (1), A. Sidorenko (1), G. Obermeier (2), S. Gsell (2), M., Schreck (2), C. M\"uller (2), S. Horn (2), R. Tidecks (2), L.R. Tagirov (3), ((1) Institute of Applied Physics, LISES ASM, Kishinev, Moldova, (2) Institut, fuer Physik, Universitaet Augsburg, Germany
TL;DR
This paper reports the first observation of re-entrant superconductivity in Nb/Cu(1-x)Ni(x) bilayers, demonstrating oscillations of the pairing function and FFLO-like states in superconductor/ferromagnet systems.
Contribution
It provides experimental evidence of re-entrant superconductivity and pairing function oscillations in superconductor/ferromagnet bilayers, revealing new quantum states.
Findings
Superconductivity is suppressed and reappears with increasing ferromagnetic layer thickness.
Evidence of pairing function oscillations in the ferromagnetic layer.
Observation of FFLO-like states in superconductor/ferromagnet bilayers.
Abstract
We report on the first observation of a pronounced re-entrant superconductivity phenomenon in superconductor/ferromagnetic layered systems. 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 d_{CuNi} of the ferromagnetic layer, until complete suppression of superconductivity is observed at d_{CuNi}= 4 nm. Increasing the Cu(1-x)Ni(x) layer thickness further, superconductivity reappears at d_{CuNi}=13 nm. Our experiments give evidence for the pairing function oscillations associated with a realization of the quasi-one dimensional Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) like state in the ferromagnetic layer.
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