Cooperative Ordering of Gapped and Gapless Spin Networks in Cu2Fe2Ge4O13

T. Masuda, A. Zheludev, B. Grenier, S. Imai, K. Uchinokura, E. Ressouche, and S. Park
Phys. Rev. Lett. 93, 077202 – Published 9 August 2004

Abstract

The unusual magnetic properties of a novel low-dimensional quantum ferrimagnet Cu2Fe2Ge4O13 are studied using bulk methods, neutron diffraction, and inelastic neutron scattering. It is shown that this material can be described in terms of two low-dimensional quantum spin subsystems, one gapped and the other gapless, characterized by two distinct energy scales. Long-range magnetic ordering observed at low temperatures is a cooperative phenomenon caused by weak coupling of these two spin networks.

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  • Received 20 April 2004

DOI:https://doi.org/10.1103/PhysRevLett.93.077202

©2004 American Physical Society

Authors & Affiliations

T. Masuda1,*, A. Zheludev1, B. Grenier2, S. Imai3,†, K. Uchinokura3,‡, E. Ressouche2, and S. Park4

  • 1Condensed Matter Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee, 37831-6393, USA
  • 2CEA-Grenoble, DRFMC / SPSMS / MDN, 17 rue des Martyrs, 38054 Grenoble, Cedex, France
  • 3Department of Advanced Materials Science, University of Tokyo, 5-1-5, Kashiwa-no-ha, Kashiwa, 277-8581, Japan
  • 4NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland, 20899, USA

  • *Electronic address: masudat@ornl.gov
  • Present address: Optical Device Dept. R & D Divisions, The Furukawa Electronic Co., Ltd. 2-4-3, Okano, Nishi-ku, Yokohama, Kanagawa, 220-0073, Japan
  • Present address: The Institute of Physical and Chemical Research (RIKEN), Wako, Saitama 351-0198, Japan

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Issue

Vol. 93, Iss. 7 — 13 August 2004

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