title: Field-induced spin-density wave beyond hidden order in URu2Si2.
abstract: URu2Si2is one of the most enigmatic strongly correlated electron systems and offers a fertile testing ground for new concepts in condensed matter science. In spite of >30 years of intense research, no consensus on the order parameter of its low-temperature hidden-order phase exists. A strong magnetic field transforms the hidden order into magnetically ordered phases, whose order parameter has also been defying experimental observation. Here, thanks to neutron diffraction under pulsed magnetic fields up to 40 T, we identify the field-induced phases of URu2Si2as a spin-density-wave state. The transition to the spin-density wave represents a unique touchstone for understanding the hidden-order phase. An intimate relationship between this magnetic structure, the magnetic fluctuations and the Fermi surface is emphasized, calling for dedicated band-structure calculations.
authors.affiliation: Laboratoire National des Champs Magnétiques Intenses, UPR 3228, CNRS-UPS-INSA-UGA, 143 Avenue de Rangueil, 31400 Toulouse, France.
authors.forename: W
authors.initials: W
authors.lastname: Knafo
authors.affiliation: Laboratoire National des Champs Magnétiques Intenses, UPR 3228, CNRS-UPS-INSA-UGA, 143 Avenue de Rangueil, 31400 Toulouse, France.
authors.forename: F
authors.initials: F
authors.lastname: Duc
authors.affiliation: Service de Modélisation et d'Exploration des Matériaux, Université Grenoble Alpes et Commissariat á l'Energie Atomique, INAC, 17 rue des Martyrs, 38054 Grenoble, France.
authors.forename: F
authors.initials: F
authors.lastname: Bourdarot
authors.affiliation: Institute of Quantum Beam Science, Ibaraki University, Mito 310-8512, Japan.
authors.forename: K
authors.initials: K
authors.lastname: Kuwahara
authors.affiliation: Institute for Materials Research, Tohoku University, Sendai 980-8578, Japan.
authors.forename: H
authors.initials: H
authors.lastname: Nojiri
authors.affiliation: Institute for Materials Research, Tohoku University, Ibaraki 311-1313, Japan.|Service Photonique, Electronique et Ingénierie Quantiques, Université Grenoble Alpes et Commissariat à l'Energie Atomique, INAC, 17 rue des Martyrs, 38054 Grenoble, France.
authors.forename: D
authors.initials: D
authors.lastname: Aoki
authors.affiliation: Laboratoire National des Champs Magnétiques Intenses, UPR 3228, CNRS-UPS-INSA-UGA, 143 Avenue de Rangueil, 31400 Toulouse, France.
authors.forename: J
authors.initials: J
authors.lastname: Billette
authors.affiliation: Laboratoire National des Champs Magnétiques Intenses, UPR 3228, CNRS-UPS-INSA-UGA, 143 Avenue de Rangueil, 31400 Toulouse, France.
authors.forename: P
authors.initials: P
authors.lastname: Frings
authors.affiliation: Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156, 38042 Grenoble, France.
authors.forename: X
authors.initials: X
authors.lastname: Tonon
authors.affiliation: Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156, 38042 Grenoble, France.
authors.forename: E
authors.initials: E
authors.lastname: Lelièvre-Berna
authors.affiliation: Service Photonique, Electronique et Ingénierie Quantiques, Université Grenoble Alpes et Commissariat à l'Energie Atomique, INAC, 17 rue des Martyrs, 38054 Grenoble, France.
authors.forename: J
authors.initials: J
authors.lastname: Flouquet
authors.affiliation: Institut Laue-Langevin, 71 Avenue des Martyrs, CS 20156, 38042 Grenoble, France.
authors.forename: L-P
authors.initials: LP
authors.lastname: Regnault