London Centre for Nanotechnology, University College London, 17-19 Gordon Street, London WC1H 0AH, UK.
J Phys Condens Matter. 2010 Mar 24;22(11):116007. doi: 10.1088/0953-8984/22/11/116007. Epub 2010 Mar 5.
The rare earth double perovskite Ba(2)ErSbO(6) contains an ordered face-centred cubic lattice of Er(3+) ions, suggesting that this material is a candidate for showing the effects of geometric magnetic frustration. Crystal field effects have also been shown to be important in this series. We report a systematic experimental study involving neutron scattering and bulk measurements that show no evidence of long ranged magnetic order or spin glass freezing down to 70 mK. A description of the system in terms of a crystal field scheme is established from inelastic neutron scattering. These measurements rule out significant magnetic coupling and show that all observed properties are fully explained by a model of uncoupled magnetic Er(3+) ions.
稀土双钙钛矿 Ba(2)ErSbO(6) 包含有序的面心立方晶格的 Er(3+) 离子，表明该材料是表现出几何磁阻挫效应的候选材料。晶体场效应也被证明在这一系列中很重要。我们报告了一项系统的实验研究，涉及中子散射和体测量，结果表明在 70 mK 以下没有长程磁有序或自旋玻璃冻结的证据。从非弹性中子散射中建立了一个晶体场方案来描述该系统。这些测量排除了显著的磁耦合，并表明所有观察到的性质都可以用一个未耦合的磁 Er(3+) 离子模型来完全解释。
