Magnetic phase diagram of metallic pyrochlore lattice in the double-exchange model
Magnetic phase diagram of metallic pyrochlore lattice in the double-exchange model
复制标题
双交换模型中金属烧绿石晶格的磁相图
DOI：
10.1103/physrevb.68.014420
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发表时间：
2003
期刊：
影响因子：
--
通讯作者：
J. Inoue
中科院分区：
文献类型：
--
作者：
Daisaku Ikoma;H. Tsuchiura;J. Inoue
在双交换模型下，采用平均场近似，对金属Kagome晶格和烧绿石晶格的基态磁相图进行了理论研究。该模型包括巡游电子的跳跃，这是表示为一个单一的紧束缚带，局域自旋之间的反铁磁耦合，和铁磁交换局域和巡游电子自旋之间的相互作用。相图被发现是相当不敏感的铁磁交换相互作用，但显示出丰富的各种磁结构与掺杂。铁磁和自旋玻璃相之间的交叉观察到的RE2Mo2O7烧绿石晶格，其中RE表示稀土离子，进行了讨论，鉴于计算结果。
The magnetic phase diagram of metallic kagomeand pyrochlore lattices at the ground state have been studied theoretically in the double-exchange model using a mean-field approximation. The model includes the hopping of itinerant electrons, which is expressed by a single tight-binding band, antiferromagnetic coupling between localized spins, and ferromagnetic exchange interaction between the localized and itinerant electron spins. The phase diagram was found to be rather insensitive to the ferromagnetic exchange interaction but to show a rich variety in magnetic structure with doping. A crossover between ferromagnetic and spin glass phases observed in RE2Mo2O7 pyrochlore lattices, where RE denotes rare-earth ions, is discussed in view of the calculated results.