Crystal-field interaction in the pyrochlore magnet Ho2Ti2O7
Crystal-field interaction in the pyrochlore magnet Ho2Ti2O7
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DOI：
10.1063/1.372565
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发表时间：
2000-05
影响因子：
3.2
通讯作者：
S. Rosenkranz;A. P. Ramirez;A. Hayashi;R. Cava;R. Siddharthan;B. Shastry
中科院分区：
文献类型：
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作者：
S. Rosenkranz;A. P. Ramirez;A. Hayashi;R. Cava;R. Siddharthan;B. Shastry
采用中子飞行时间谱法研究了钛酸盐Ho2Ti2O7的晶体场相互作用。通过与观测到的中子能谱的拟合，确定了晶体场参数和相应的能级格式。基态是一个分离良好的Eg双重态，具有很强的伊辛类各向异性，这可以在焦绿石晶格中引起挫折。利用为Ho化合物确定的晶体场参数来估计其他焦绿石磁体的晶体场势，我们也发现了Dy的Ising型行为。相比之下，Er和Yb的几乎是平面的各向异性，因为在这种情况下可能的自旋取向范围是连续的。
Neutron time-of-flight spectroscopy has been employed to study the crystal-field interaction in the pyrochlore titanate Ho2Ti2O7. The crystal-field parameters and corresponding energy-level scheme have been determined from a profile fit to the observed neutron spectra. The ground state is a well separated Eg doublet with a strong Ising-like anisotropy, which can give rise to frustration in the pyrochlore lattice. Using the crystal-field parameters determined for the Ho compound as an estimate of the crystal-field potential in other pyrochlore magnets, we also find the Ising type behavior for Dy. In contrast, the almost planar anisotropy found for Er and Yb prevents frustration, because of the continuous range of possible spin orientations in this case.