The Magnetic Structure of $Er_{2}Ti_{2}O_{7}$

Details The Magnetic Structure of $Er_{2}Ti_{2}O_{7}$ The Magnetic Structure of $Er_{2}Ti_{2}O_{7}$

2011-03-15

arxiv.org/abs/1103.2862v1

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 5 figures

Scientific paper

We employ the previously published neutron scattering experiments\cite{1,2,3} to suggest that Er$_2$Ti$_2$O$_7$ has a broken-symmetry multiple-{\bf q} state with tetragonal magnetic symmetry\cite{4}. The ordered moments do not appear to lie close to the crystal-field anticipated directions\cite{5} and we suggest that the low energy gapless mode, visible in specific-heat measurements\cite{6}, 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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