Two geometrically frustrated magnets studied by neutron diffraction

Details Two geometrically frustrated magnets studied by neutron diffraction Two geometrically frustrated magnets studied by neutron diffraction

2006-02-16

arxiv.org/abs/cond-mat/0602384v1

Physics

Condensed Matter

Strongly Correlated Electrons

6 pages, 4 figures, International Conference on Neutron Scattering Sydney(2005)

Scientific paper

10.1016/j.physb.2006.05.026

In the pyrochlore compounds, Tb$_2$Ti$_2$O$_7$ and Tb$_2$Sn$_2$O$_7$, only the Tb$^{3+}$ ions are magnetic. They exhibit quite abnormal -- and, in view of their chemical similarity, strikingly different -- magnetic behaviour, as probed by neutron diffraction at ambient and applied pressure. Tb$_2$Ti$_2$O$_7$ is a cooperative paramagnet (`spin liquid'), without long range order at ambient pressure; however, it does become ordered under pressure. By contrast, Tb$_2$Sn$_2$O$_7$ enters an "ordered spin ice" state already at ambient pressure. We analyse a simple model which already clearly exhibits some of the qualitative features observed experimentally. Overall, comparing these two compounds emphasizes the power of small perturbations in selecting low-temperature states in geometrically frustrated systems.

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