Magnetic excitations in the geometric frustrated multiferroic CuCrO2

M. Frontzek, J. T. Haraldsen, A. Podlesnyak, M. Matsuda, A. D. Christianson, R. S. Fishman, A. S. Sefat, Y. Qiu, J. R. D. Copley, S. Barilo, S. V. Shiryaev, and G. Ehlers
Phys. Rev. B 84, 094448 – Published 28 September 2011

Abstract

In this paper detailed neutron scattering measurements of the magnetic excitation spectrum of CuCrO2 in the ordered state below TN1=24.2 K are presented. The spectra are analyzed using a model Hamiltonian which includes intralayer exchange up to the next-next-nearest neighbor and interlayer exchange. We obtain a definite parameter set and show that exchange interaction terms beyond the next-nearest neighbor are important to describe the inelastic excitation spectrum. The magnetic ground state structure generated with our parameter set is in agreement with the structure proposed for CuCrO2 from the results of single crystal diffraction experiments previously published. We argue that the role of the interlayer exchange is crucial to understand the incommensurability of the magnetic structure as well as the spin-charge coupling mechanism.

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  • Received 7 July 2011

DOI:https://doi.org/10.1103/PhysRevB.84.094448

©2011 American Physical Society

Authors & Affiliations

M. Frontzek1,*, J. T. Haraldsen2,3,4, A. Podlesnyak1, M. Matsuda1, A. D. Christianson1, R. S. Fishman4, A. S. Sefat4, Y. Qiu5,6, J. R. D. Copley5, S. Barilo7, S. V. Shiryaev7, and G. Ehlers1

  • 1Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 2Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 3Center for Integrated Nanotechnologies, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA
  • 4Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 5NIST Center for Neutron Research, National Institute of Standards and Technology, Gaithersburg, Maryland 20899, USA
  • 6Department of Materials Science and Engineering, University of Maryland, College Park, Maryland, 20742, USA
  • 7Institute of Solid State and Semiconductor Physics, Minsk 220 072, Belarus

  • *Corresponding author: frontzekmd@ornl.gov

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Issue

Vol. 84, Iss. 9 — 1 September 2011

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