Spin Amplitude Modulation Driven Magnetoelectric Coupling in the New Multiferroic FeTe2O5Br

M. Pregelj, O. Zaharko, A. Zorko, Z. Kutnjak, P. Jeglič, P. J. Brown, M. Jagodič, Z. Jagličić, H. Berger, and D. Arčon
Phys. Rev. Lett. 103, 147202 – Published 30 September 2009

Abstract

The magnetic and ferroelectric properties of the layered geometrically frustrated cluster compound FeTe2O5Br were investigated with single-crystal neutron diffraction and dielectric measurements. An incommensurate transverse amplitude modulated magnetic order with the wave vector q=(12,0.463,0) develops below TN=10.6(2)K. Simultaneously, a ferroelectric order due to exchange striction involving polarizable Te4+ lone-pair electrons develops perpendicular to q and to Fe3+ magnetic moments. The observed magnetoelectric coupling is proposed to originate from the temperature dependent phase difference between neighboring amplitude modulation waves.

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  • Received 12 June 2009

DOI:https://doi.org/10.1103/PhysRevLett.103.147202

©2009 American Physical Society

Authors & Affiliations

M. Pregelj1, O. Zaharko2,*, A. Zorko1, Z. Kutnjak1, P. Jeglič1, P. J. Brown3, M. Jagodič4, Z. Jagličić4,5, H. Berger6, and D. Arčon1,7,†

  • 1“Jozef Stefan” Institute, Jamova 39, 1000 Ljubljana, Slovenia
  • 2Laboratory for Neutron Scattering, ETHZ and PSI, CH-5232 Villigen, Switzerland
  • 3Institut Laue-Langevin, 156X, 38042 Grenoble Cedex, France
  • 4Institute of Mathematics, Physics and Mechanics, Jadranska 19, 1000 Ljubljana, Slovenia
  • 5Faculty of Civil and Geodetic Engineering, University of Ljubljana, Jamova 2, 1000 Ljubljana, Slovenia
  • 6Institute of Physics of Complex Matter, EPFL, 1015 Lausanne, Switzerland
  • 7Faculty of Mathematics and Physics, University of Ljubljana, Jadranska 19, 1000 Ljubljana, Slovenia

  • *oksana.zaharko@psi.ch
  • denis.arcon@ijs.si

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Vol. 103, Iss. 14 — 2 October 2009

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