title: Hidden one-dimensional spin modulation in a three-dimensional metal.
abstract: Pressure can transform a transparent material into an opaque one, quench the moments in a magnet and force solids to flow like liquids. At 15 GPa, the pressure found 500 km below the earth's surface, the semiconductors silicon and germanium superconduct. Yet, at this same pressure, we show here that the magnetism in metallic GdSi remains completely robust even as it shrinks by one-seventh of its volume. Non-resonant X-ray magnetic diffraction in a specially designed diamond anvil cell, combined with band structure calculations, reveal the stability of the incommensurate spin density wave, which can be traced to a persistently nested portion of the Fermi surface that becomes increasingly one-dimensional under pressure. A cooperative interaction between nested, itinerant spins and local magnetic moments provides the organizing principle for the modulated magnetic order, salient both for its insights into the role of topology in ordered states and its potential functionality.
authors.affiliation: 1] The Advanced Photon Source, Argonne National Laboratory, Argonne, Illinois 60439, USA [2] The James Franck Institute and Department of Physics, University of Chicago, Chicago, Illinois 60637, USA.
authors.forename: Yejun
authors.initials: Y
authors.lastname: Feng
authors.affiliation: The James Franck Institute and Department of Physics, University of Chicago, Chicago, Illinois 60637, USA.
authors.forename: Jiyang
authors.initials: J
authors.lastname: Wang
authors.affiliation: The James Franck Institute and Department of Physics, University of Chicago, Chicago, Illinois 60637, USA.
authors.forename: A
authors.initials: A
authors.lastname: Palmer
authors.affiliation: Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
authors.forename: J A
authors.initials: JA
authors.lastname: Aguiar
authors.affiliation: 1] Materials Science and Technology Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA [2] Physics Division, National Science Foundation, Arlington, Virginia 22230, USA.
authors.forename: B
authors.initials: B
authors.lastname: Mihaila
authors.affiliation: 1] Department of Materials Science and Engineering, University of Tennessee, Knoxville, Tennessee 37996, USA [2] Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors.forename: J-Q
authors.initials: JQ
authors.lastname: Yan
authors.affiliation: 1] The James Franck Institute and Department of Physics, University of Chicago, Chicago, Illinois 60637, USA [2] Physical Sciences and Engineering, Argonne National Laboratory, Argonne, Illinois 60439, USA.
authors.forename: P B
authors.initials: PB
authors.lastname: Littlewood
authors.affiliation: The James Franck Institute and Department of Physics, University of Chicago, Chicago, Illinois 60637, USA.
authors.forename: T F
authors.initials: TF
authors.lastname: Rosenbaum