title: 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 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.
authors.affiliation: 1] Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH, Outstation at Institut Laue-Langevin, Boîte Postale 156, F-38042 Grenoble Cedex 9, France [2] Institut für Kristallographie der RWTH Aachen University, D-52056 Aachen, Germany.
authors.forename: Hai-Feng
authors.initials: HF
authors.lastname: Li
authors.affiliation: Key Laboratory of Space Applied Physics and Chemistry of Ministry of Education, Department of Applied Physics, Northwestern Polytechnical University, Xi'an 710072, P.R. China.
authors.forename: Chongde
authors.initials: C
authors.lastname: Cao
authors.affiliation: Institut Laue-Langevin, Boîte Postale 156, F-38042 Grenoble Cedex 9, France.
authors.forename: Andrew
authors.initials: A
authors.lastname: Wildes
authors.affiliation: Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH, Outstation at Institut Laue-Langevin, Boîte Postale 156, F-38042 Grenoble Cedex 9, France.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Schmidt
authors.affiliation: Jülich Centre for Neutron Science JCNS, Forschungszentrum Jülich GmbH, Outstation at Institut Laue-Langevin, Boîte Postale 156, F-38042 Grenoble Cedex 9, France.
authors.forename: Karin
authors.initials: K
authors.lastname: Schmalzl
authors.affiliation: European Synchrotron Radiation Facility, Boîte Postale 220, F-38043 Grenoble Cedex, France.
authors.forename: Binyang
authors.initials: B
authors.lastname: Hou
authors.affiliation: SPSMS, UMR-E 9001, CEA-INAC/UJF-Grenoble 1, MDN, 17 rue des Martyrs, F-38054 Grenoble Cedex 9, France.
authors.forename: Louis-Pierre
authors.initials: LP
authors.lastname: Regnault
authors.affiliation: Institut für Kristallographie der RWTH Aachen University, D-52056 Aachen, Germany.
authors.forename: Cong
authors.initials: C
authors.lastname: Zhang
authors.affiliation: Peter Grünberg Institut PGI and JARA-FIT, Forschungszentrum Jülich GmbH, D-52425 Jülich, Germany.
authors.forename: Paul
authors.initials: P
authors.lastname: Meuffels
authors.affiliation: Leibniz-Institut für Festkörper- und Werkstoffforschung (IFW) Dresden, Postfach 270116, D-01171 Dresden, Germany.
authors.forename: Wolfgang
authors.initials: W
authors.lastname: Löser
authors.affiliation: Institut für Kristallographie der RWTH Aachen University, D-52056 Aachen, Germany.
authors.forename: Georg
authors.initials: G
authors.lastname: Roth