The Magnetic Structure of Er2Ti2O7
Abstract
We employ the previously published neutron scattering experiments1,2,3 to suggest that Er2Ti2O7 has a broken-symmetry multiple- q state with tetragonal magnetic symmetry4. The ordered moments do not appear to lie close to the crystal-field anticipated directions5 and we suggest that the low energy gapless mode, visible in specific-heat measurements6, is not of the usual transverse isotropic Goldstone-mode type, but is longitudinal and is associated with the internal transfer of magnetism between distinct magnetic Bragg spots.
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