Magnetic pyrochlore oxides
Magnetic pyrochlore oxides
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DOI：
10.1103/revmodphys.82.53
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发表时间：
2010-01-01
影响因子：
44.1
通讯作者：
Greedan, John E.
中科院分区：
文献类型：
--
作者：
Gardner, Jason S.;Gingras, Michel J. P.;Greedan, John E.
在过去的20年左右的时间里，人们对A(2)(3+)B(2)(4+)O(7)型焦绿石氧化物的磁性行为产生了极大的兴趣，其中A是稀土离子，B通常是过渡金属。A和B两个位置都形成了一个共享四面体的角网络，这是几何受挫磁铁的典型框架。在这些系统中，形成符合热力学第三定律的长程有序基态的自然倾向被挫败，导致了一些新的短程有序替代方案，如自旋玻璃、自旋冰和自旋液体，以及许多新的物理学。本文主要从材料的角度，结合适当的理论背景，对烧绿石氧化物中发现的各种性质进行了综述。
Within the past 20 years or so, there has occurred an explosion of interest in the magnetic behavior of pyrochlore oxides of the type A(2)(3+)B(2)(4+)O(7), where A is a rare-earth ion and B is usually a transition metal. Both the A and B sites form a network of corner-sharing tetrahedra which is the quintessential framework for a geometrically frustrated magnet. In these systems the natural tendency to form long-range ordered ground states in accord with the third law of thermodynamics is frustrated, resulting in some novel short-range ordered alternatives, such as spin glasses, spin ices, and spin liquids, and much new physics. This article attempts to review the myriad of properties found in pyrochlore oxides, mainly from a materials perspective, but with an appropriate theoretical context.