Two geometrically frustrated magnets studied by neutron diffraction
摘要
In the pyrochlore compounds, TbTiO and TbSnO, only the Tb 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. TbTiO is a cooperative paramagnet (`spin liquid'), without long range order at ambient pressure; however, it does become ordered under pressure. By contrast, TbSnO 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.
引用
@article{arxiv.cond-mat/0602384,
title = {Two geometrically frustrated magnets studied by neutron diffraction},
author = {I. Mirebeau and A. Apetrei and I. N. Goncharenko and R. Moessner},
journal= {arXiv preprint arXiv:cond-mat/0602384},
year = {2009}
}
备注
6 pages, 4 figures, International Conference on Neutron Scattering Sydney(2005)