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Coexistence of long-range magnetic order and superconductivity from Campbell penetration depth measurements

TitleCoexistence of long-range magnetic order and superconductivity from Campbell penetration depth measurements
Publication TypeJournal Article
Year of Publication2009
AuthorsProzorov R, Vannette MD, Gordon RT, Martin C, Bud'ko SL, Canfield PC
Journal TitleSuperconductor Science & Technology
Volume22
Pages034008
Date Published03/01
ISBN Number0953-2048
Accession NumberISI:000263564500009
Keywordsdestruction, erni2b2c, errh4b4, ferromagnetism, flux-line-lattice, high-temperature superconductors, ii superconductors, single-crystals, state, vortices
Abstract

Application of a tunnel-diode resonator (TDR) technique for studies of the vortex response in magnetic superconductors is described. Operating at very small excitation fields and a sufficiently high frequency, the TDR was used to probe the small-amplitude linear AC response in several types of single crystals where long-range magnetic order coexists with bulk superconductivity. Full local-moment ferromagnetism destroys superconductivity and can coexist with it only in a narrow temperature range (similar to 0.3 K). In contrast, weak ferromagnetic as well as antiferromagnetic orders can coexist with bulk superconductivity and may even lead to an enhancement of vortex pinning. By analyzing the Campbell penetration depth we find a sharp increase of the true critical current in the vicinity of the magnetic phase transitions. We conclude that critical magnetic fluctuations are responsible for this enhancement.
URL<Go to ISI>://000263564500009
DOI10.1088/0953-2048/22/3/034008