Pauli paramagnetic effects on vortices in superconducting TmNi2B2C

TitlePauli paramagnetic effects on vortices in superconducting TmNi2B2C
Publication TypeJournal Article
Year of Publication2007
AuthorsDeBeer-Schmitt L, Eskildsen MR, Ichioka M, Machida K, Jenkins N, Dewhurst CD, Abrahamsen AB, Bud'ko SL, Canfield PC
Journal TitlePhysical Review Letters
Date PublishedOct
Type of ArticleArticle
ISBN Number0031-9007
Accession NumberISI:000250296000059
Keywordsii superconductors, magnetic order, vortex state

The magnetic field distribution around the vortices in TmNi2B2C in the paramagnetic phase was studied experimentally as well as theoretically. The vortex form factor, measured by small-angle neutron scattering, is found to be field independent up to 0.6H(c2) followed by a sharp decrease at higher fields. The data are fitted well by solutions to the Eilenberger equations when paramagnetic effects due to the exchange interaction with the localized 4f Tm moments are included. The induced paramagnetic moments around the vortex cores act to maintain the field contrast probed by the form factor.

Alternate JournalPhys. Rev. Lett.