Ising versus XY anisotropy in frustrated R${}_2$Ti${}_2$O${}_7$ compounds as seen by polarized neutrons

Abstract

We studied the field induced magnetic order in R${}_2$Ti${}_2$O${}_7$ 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 \{${\chi }_{\parallel },{\chi }_{\perp }$\} 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 ${\chi }_{\parallel }$ and ${\chi }_{\perp }$ 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.

arXiv comment4 pages including 4 figures

Cited by in corpus (6)

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• A spin liquid with pinch-line singularities on the pyrochlore lattice
• Effective quantum pseudospin-1/2 model for Yb pyrochlore oxides
• Crystal Shape-Dependent Magnetic Susceptibility and Curie Law Crossover in the Spin Ices Dy2Ti2O7 and Ho2Ti2O7
• Magnetisation process in Er2Ti2O7 and Tb2Ti2O7 at very low temperature