Magnetic density of states at low energy in geometrically frustrated systems.
Magnetic density of states at low energy in geometrically frustrated systems.
复制标题
DOI：
10.1103/physrevlett.95.047203
复制
发表时间：
2005-06
影响因子：
8.6
通讯作者：
A. Yaouanc;P. D. de Réotier;V. Glazkov;C. Marin;P. Bonville;J. Hodges;P. Gubbens;S. Sakarya;C. Baines
中科院分区：
文献类型：
--
作者：
A. Yaouanc;P. D. de Réotier;V. Glazkov;C. Marin;P. Bonville;J. Hodges;P. Gubbens;S. Sakarya;C. Baines
利用μ介子自旋弛豫测量，我们发现焦绿石化合物Gd(2)Ti(2)O(7)在其低于约1k的磁有序相中，显示出持续的自旋动力学，直至低至20mk。诱导μ介子弛豫的特征可以通过涉及两个磁激发的散射过程来解释，其状态密度在低能量时呈上升趋势，并且与温度呈线性关系。我们提出这样的态密度是几何挫折磁性材料的一般特征。
Using muon-spin-relaxation measurements we show that the pyrochlore compound Gd(2)Ti(2)O(7), in its magnetically ordered phase below approximately 1 K, displays persistent spin dynamics down to temperatures as low as 20 mK. The characteristics of the induced muon relaxation can be accounted for by a scattering process involving two magnetic excitations, with a density of states characterized by an upturn at low energy and a small gap depending linearly on the temperature. We propose that such a density of states is a generic feature of geometrically frustrated magnetic materials.