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Distinct itinerant spin-density waves and local-moment antiferromagnetism in an intermetallic ErPd2Si2 single crystal

Abstract : Identifying 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 Q(C) = (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 Q(C) 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.
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https://hal-cea.archives-ouvertes.fr/cea-01731471
Contributor : Jérôme Planès <>
Submitted on : Wednesday, March 14, 2018 - 11:54:19 AM
Last modification on : Monday, July 20, 2020 - 2:02:01 PM

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Hai-Feng Li, Chongde Cao, Andrew Wildes, Wolfgang Schmidt, Karin Schmalzl, et al.. Distinct itinerant spin-density waves and local-moment antiferromagnetism in an intermetallic ErPd2Si2 single crystal. Scientific Reports, Nature Publishing Group, 2015, 5, pp.7968. ⟨10.1038/srep07968⟩. ⟨cea-01731471⟩

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