CC BY-NC-SA 4.0 UnportedLi, Hai-FengCao, ChongdeWildes, AndrewSchmidt, WolfgangSchmalzl, KarinHou, BinyangRegnault, Louis-PierreZhang, CongMeuffels, PaulLöser, WolfgangRoth, Georg2018-07-242019-06-282015https://doi.org/10.34657/5032https://oa.tib.eu/renate/handle/123456789/1540Identifying the nature of magnetism, itinerant or localized, remains a major challenge in condensed-matter science. Purely localized moments appear only in magnetic insulators, whereas itinerant moments more or less co-exist with localized moments in metallic compounds such as the doped-cuprate or the iron-based superconductors, hampering a thorough understanding of the role of magnetism in phenomena like superconductivity or magnetoresistance. Here we distinguish two antiferromagnetic modulations with respective propagation wave vectors at Q± = (H ± 0.557(1), 0, L ± 0.150(1)) and QC = (H ± 0.564(1), 0, L), where (H, L) are allowed Miller indices, in an ErPd2Si2 single crystal by neutron scattering and establish their respective temperature- and field-dependent phase diagrams. The modulations can co-exist but also compete depending on temperature or applied field strength. They couple differently with the underlying lattice albeit with associated moments in a common direction. The Q± modulation may be attributed to localized 4f moments while the QC correlates well with itinerant conduction bands, supported by our transport studies. Hence, ErPd2Si2 represents a new model compound that displays clearly-separated itinerant and localized moments, substantiating early theoretical predictions and providing a unique platform allowing the study of itinerant electron behavior in a localized antiferromagnetic matrix.application/pdfenghttps://creativecommons.org/licenses/by-nc-sa/4.0/620Applied physicsElectronic properties and materialsMagnetic properties and materialsSpintronicsArticle