Ising versus XY Anisotropy in Frustrated R2Ti2O7 Compounds as “Seen” by Polarized Neutrons

H. Cao, A. Gukasov, I. Mirebeau, P. Bonville, C. Decorse, and G. Dhalenne
Phys. Rev. Lett. 103, 056402 – Published 29 July 2009

Abstract

We studied the field induced magnetic order in R2Ti2O7 pyrochlore compounds with either uniaxial (R=Ho, Tb) or planar (R=Er, Yb) anisotropy, by polarized neutron diffraction. The determination of the local susceptibility tensor {χ,χ} provides a universal description of the field induced structures in the paramagnetic phase (2–270 K), whatever the field value (1–7 T) and direction. Comparison of the thermal variations of χ and χ with calculations using the rare earth crystal field shows that exchange and dipolar interactions must be taken into account. We determine the molecular field tensor in each case and show that it can be strongly anisotropic.

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  • Received 8 April 2009

DOI:https://doi.org/10.1103/PhysRevLett.103.056402

©2009 American Physical Society

Authors & Affiliations

H. Cao1, A. Gukasov1, I. Mirebeau1, P. Bonville2, C. Decorse3, and G. Dhalenne3

  • 1Laboratoire Léon Brillouin, CEA-CNRS, CE-Saclay, 91191 Gif-sur-Yvette, France
  • 2Service de Physique de l’Etat Condensé, CEA-CNRS, CE-Saclay, 91191 Gif-Sur-Yvette, France
  • 3Laboratoire de Physico-Chimie de l’Etat Solide, ICMMO, Université Paris-Sud, 91405 Orsay, France

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Issue

Vol. 103, Iss. 5 — 31 July 2009

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