Abstract
The electromagnetic response of the superconducting ferromagnets RuSr2 Gd1.5 Ce0.5 Cu2 O10 (Ru-1222 Gd) in an ac magnetic field of finite amplitude is investigated. Taking into account weak links between granules and magnetization of the magnetic sublattice, it is shown that the response of a sample in a superconducting state at the fundamental frequency and at the frequency of the third harmonic can be described by a nonlinear equation for the macroscopic field. Generation of the harmonic at temperatures above the superconducting transition corresponds to Rayleigh's mechanism. For various regimes of sample cooling, the internal magnetic field determined by the magnetic sublattice is measured. This is direct evidence of the coexistence of ferromagnetic and superconductive order parameters in high- Tc ruthenocuprates.
Original language | English |
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Pages (from-to) | 642-646 |
Number of pages | 5 |
Journal | Low Temperature Physics |
Volume | 33 |
Issue number | 8 |
DOIs | |
State | Published - 2007 |