Magnetic relaxation in rare-earth oxide pyrochlores
Magnetic relaxation in rare-earth oxide pyrochlores
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DOI：
10.1134/1.2103216
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发表时间：
2005-01-01
影响因子：
1.1
通讯作者：
Ryzhkin, IA
中科院分区：
文献类型：
--
作者：
Ryzhkin, IA
发展了几何受阻三维磁体的磁弛豫理论，该理论可用反铁磁伊辛模型来描述。这些磁性材料以最近合成的一些稀土氧化物焦绿石为例，如Dy2Ti2O7、Ho2Ti2O7或Yb2Ti2O7。提出了一种基于伊辛磁体中的自旋有序化和冰中质子有序化的类比模型。在这个模型中，磁点缺陷被视为非相互作用的准粒子，其特征是明确的能量、迁移率和有效磁电荷，其基本作用类似于冰物理中的离子缺陷或半导体中的电子和空穴。用所提出的模型推导了磁化率随频率和温度变化的表达式。(C)2005年昂宿星团出版公司。
A theory of magnetic relaxation is developed for geometrically frustrated three-dimensional magnets that can be described by an antiferromagnetic Ising model. These magnetic materials are exemplified by some of the recently synthesized rare-earth oxide pyrochlores, such as Dy2Ti2O7, Ho2Ti2O7, or Yb2Ti2O7. A model based on an analogy between the spin ordering in Ising magnets and proton ordering in ice is proposed. In this model, magnetic point defects treated as noninteracting quasiparticles characterized by well-defined energies, mobilities, and effective magnetic charges play a fundamental role analogous to that of ion defects in the physics of ice or by electrons and holes in semiconductors. The proposed model is used to derive expressions for magnetic susceptibility as a function of frequency and temperature. (c) 2005 Pleiades Publishing, Inc.