Magnetic Structure, Phase Diagram, and a New Type of Spin-Flop Transition Dominated by Higher Order Interaction in a Localized 5f System U3Pd20Si6

Y. Koike, N. Metoki, Y. Haga, K. A. McEwen, M. Kohgi, R. Yamamoto, N. Aso, N. Tateiwa, T. Komatsubara, N. Kimura, and H. Aoki
Phys. Rev. Lett. 89, 077202 – Published 26 July 2002

Abstract

The magnetic structure of the localized-5f uranium intermetallic compound U3Pd20Si6 has been determined by means of a neutron diffraction experiment. Our data demonstrate that this compound has a collinear coupling of the sublattice ordering of the uranium spins on the 4a and 8c sites. We conclude that higher-order exchange and/or quadrupole interactions are necessary to stabilize this unique collinear structure. We discovered a new type of spin-flop transition against the uniaxial anisotropy induced by this collinear coupling.

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  • Received 28 December 2001

DOI:https://doi.org/10.1103/PhysRevLett.89.077202

©2002 American Physical Society

Authors & Affiliations

Y. Koike1,2, N. Metoki1, Y. Haga1, K. A. McEwen3, M. Kohgi4, R. Yamamoto4, N. Aso5, N. Tateiwa6, T. Komatsubara7, N. Kimura7, and H. Aoki7

  • 1Advanced Science Research Center, Japan Atomic Energy Research Institute, Tokai, Ibaraki, 319-1195, Japan
  • 2Japan Science and Technology Corporation, Kawaguchi, Saitama 332-0012, Japan
  • 3Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT, United Kingdom
  • 4Department of Physics, Tokyo Metropolitan University, Hachioji, Tokyo 192-0397, Japan
  • 5Neutron Scattering Laboratory, Institute for Solid State Physics, University of Tokyo, Ibaraki 319-1106, Japan
  • 6Research Center for Materials Science at Extreme Conditions, Osaka University, Toyonaka, Osaka 560-8531, Japan
  • 7Center for Very Low Temperature Science, Tohoku University, Sendai 980-8545, Japan

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Issue

Vol. 89, Iss. 7 — 12 August 2002

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