Abstract
Application of a tunnel-diode resonator (TDR) technique for studies of the vortex responsein magnetic superconductors is described. Operating at very small excitation fields and asufficiently high frequency, the TDR was used to probe the small-amplitude linearAC response in several types of single crystals where long-range magnetic ordercoexists with bulk superconductivity. Full local-moment ferromagnetism destroyssuperconductivity and can coexist with it only in a narrow temperature range(∼0.3 K). In contrast, weak ferromagnetic as well as antiferromagnetic orders can coexistwith bulk superconductivity and may even lead to an enhancement of vortexpinning. By analyzing the Campbell penetration depth we find a sharp increase ofthe true critical current in the vicinity of the magnetic phase transitions. Weconclude that critical magnetic fluctuations are responsible for this enhancement.
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