Field-induced spin-density wave beyond hidden order in URu2Si2

W. Knafo (), F. Duc, F. Bourdarot, K. Kuwahara, H. Nojiri, D. Aoki, J. Billette, P. Frings, X. Tonon, E. Lelièvre-Berna, J. Flouquet and L.-P. Regnault
Additional contact information
W. Knafo: Laboratoire National des Champs Magnétiques Intenses, UPR 3228, CNRS-UPS-INSA-UGA
F. Duc: Laboratoire National des Champs Magnétiques Intenses, UPR 3228, CNRS-UPS-INSA-UGA
F. Bourdarot: Service de Modélisation et d'Exploration des Matériaux, Université Grenoble Alpes et Commissariat á l'Energie Atomique, INAC
K. Kuwahara: Institute of Quantum Beam Science, Ibaraki University
H. Nojiri: Institute for Materials Research, Tohoku University
D. Aoki: Institute for Materials Research, Tohoku University
J. Billette: Laboratoire National des Champs Magnétiques Intenses, UPR 3228, CNRS-UPS-INSA-UGA
P. Frings: Laboratoire National des Champs Magnétiques Intenses, UPR 3228, CNRS-UPS-INSA-UGA
X. Tonon: Institut Laue-Langevin
E. Lelièvre-Berna: Institut Laue-Langevin
J. Flouquet: Service Photonique, Electronique et Ingénierie Quantiques, Université Grenoble Alpes et Commissariat à l'Energie Atomique, INAC
L.-P. Regnault: Institut Laue-Langevin

Nature Communications, 2016, vol. 7, issue 1, 1-7

Abstract: Abstract URu2Si2 is 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 URu2Si2 as 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.

Date: 2016
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DOI: 10.1038/ncomms13075

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