The internal magnetic field in superconducting ferromagnets
Abstract
We have measured the nonlinear response to the ac magnetic field in the superconducting weak ferromagnet Ru-1222, at different regimes of sample cooling which provides unambiguous evidence of the interplay of the domain structure and the vorticity in the superconducting state. This is direct proof of coexistence of ferromagnetic and superconductive order parameters in high-Tc ruthenocuprates.
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