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Ising versus<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>X</mml:mi><mml:mi>Y</mml:mi></mml:math>Anisotropy in Frustrated<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>R</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Ti</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="bold">O</mml:mi><mml:mn>7</mml:mn></mml:msub></mml:math>Compounds as “Seen” by Polarized Neutrons
We studied the field induced magnetic order in ${R}_{2}{\mathrm{Ti}}_{2}{\mathrm{O}}_{7}$ pyrochlore compounds with either uniaxial ($R=\mathrm{Ho}$, Tb) or planar ($R=\mathrm{Er}$, Yb) anisotropy, by polarized neutron diffraction. The determination of the local susceptibility tensor ${{\ensuremath{\chi}}_{\ensuremath{\Vert}},{\ensuremath{\chi}}_{\ensuremath{\perp}}}$ provides a universal description of the field induced structures in the paramagnetic phase (2--270 K), whatever the …