Frustrated Magnetism and Cooperative Phase Transitions in Spinels
Frustrated Magnetism and Cooperative Phase Transitions in Spinels
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DOI：
10.1143/jpsj.79.011004
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发表时间：
2010-01-01
影响因子：
1.7
通讯作者：
Broholm, Collin
中科院分区：
文献类型：
--
作者：
Lee, Seung-Hun;Takagi, Hidenori;Broholm, Collin
尖晶石晶体系统AB（2）O（4）是研究磁性和轨道阻挫效应的肥沃土壤。实验结果，主要集中在中子和同步辐射X射线散射技术，在此审查尖晶石与磁性B离子。重点是新的集体现象，如零能量激发模式在自旋液相，零场和场诱导的新相变，出现复杂的本地自旋实体，和重费米子行为。这种奇异性质的多样性源于它们与简并态之间的临界点的紧密接近以及不同自由度（如自旋、轨道和晶格）之间的微妙平衡。
The spinel crystal system, AB(2)O(4), has been fertile ground in studying the effects of magnetic and orbital frustration. The experimental findings, with primary focus on neutron and synchrotron x-ray scattering techniques, are hereby reviewed in spinels with magnetic B ions. Highlighted are novel collective phenomena, such as the zero-energy excitation mode in the spin liquid phase, zero-field and field-induced novel phase transitions, the emergence of complex local spin entities, and heavy fermionic behaviors. Such a diversity in the exotic properties stems from their close proximity to critical points among degenerate states and a delicate balance among different degrees of freedom such as spin, orbital, and lattice.