Microwave surface impedance of proximity-coupled superconducting (Nb) / spin-glass (CuMn) bilayers

Details Microwave surface impedance of proximity-coupled superconducting (Nb) / spin-glass (CuMn) bilayers Microwave surface impedance of proximity-coupled superconducting (Nb) / spin-glass (CuMn) bilayers

1998-11-24

arxiv.org/abs/cond-mat/9811347v1

Phys. Rev. B 59, 4455-4462 (1999)

Physics

Condensed Matter

Superconductivity

22 pages, 6 ps figures. Accepted for publication in Phys. Rev. B

Scientific paper

10.1103/PhysRevB.59.4455

The surface impedance of Nb/CuMn (superconducting/spin-glass) bilayers has been measured at 10 GHz with the parallel plate resonator technique to obtain information about the exotic behavior of the order parameter in superconducting/magnetic proximity systems. The data strongly differs from the superconducting/normal-metal case, showing the magnetic nature of the CuMn layer, which acts as a weak ferromagnet. The results are described in the framework of two models for the electrodynamics of superconducting/ferromagnetic (S/M) bilayers characterized by a proximity-coupling length scale which is independent of temperature.

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