Valence transition in topological Kondo insulator
Valence transition in topological Kondo insulator
复制标题
拓扑近藤绝缘体中的价态跃迁
DOI：
10.1088/1361-648x/ab4625
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发表时间：
2019-08
期刊：
影响因子：
--
通讯作者：
Song Hai-Feng
中科院分区：
文献类型：
--
作者：
Zhuang Jia-Tao;Zheng Xiao-Jun;Wang Zhi-Yong;Ming Xing;Li Huan;Liu Yu;Song Hai-Feng
利用周期安德森模型的从玻色子分析方法研究了三维拓扑近藤绝缘体的价态跃迁。通过考虑传导和局域电子之间的库仑关联效应，我们发现当局域f-能级上升到临界值以上时，会发生从近藤区到混合价态的一级价跃迁，并且这种价跃迁通常与拓扑跃迁非常接近或同时发生.在零温价态转变参数区附近，温度升高可产生从混合价态到近藤区的热价态转变，并伴随一级拓扑转变。值得注意的是，以上的临界值是远远小于产生顺磁价转变，原来的连续反铁磁转变转移到一阶，在那里发生不连续的价移。在增加时，顺磁性价转变的方法，然后收敛于一级反铁磁性转变，留下一个显着的价移动的磁性边界。连续反铁磁相变、一级反铁磁相变、顺磁价态相变和拓扑相变都概括在一个全局相图中。我们提出的奇异跃迁过程可以帮助理解拓扑近藤绝缘体候选者和其他重费米子系统中的热价变化以及压力诱导磁跃迁周围的价移。
We investigate the valence transition in three-dimensional topological Kondo insulator through slave-boson analysis of periodic Anderson model. By including the effect of intra-atomic Coulomb correlation between conduction and local electrons, we find a first-order valence transition from Kondo region to mixed valence state upon ascending of local f- level above a critical , and this valence transition usually occurs very close to or simultaneously with a topological transition. Near the parameter region of zero-temperature valence transition, rise of temperature can generate a thermal valence transition from mixed valence to Kondo region, accompanied by a first-order topological transition. Remarkably, above a critical which is considerably smaller than that generating paramagnetic valence transition, the original continuous antiferromagnetic transition is shifted to first order one, at which a discontinuous valence shift takes place. Upon increasing , the paramagnetic valence transition approaches then converges with the first-order antiferromagnetic transition, leaving a significant valence shift on the magnetic boundary. The continuous antiferromagnetic transition, first-order antiferromagnetic transition, paramagnetic valence transition and topological transitions are all summarized in a global phase diagram. Our proposed exotic transition processes can help to understand the thermal valence variation as well as the valence shift around the pressure-induced magnetic transition in topological Kondo insulator candidates and in other heavy-fermion systems.
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影响因子：
8.6
作者：
S. Watanabe;A. Tsuruta;K. Miyake;J. Flouquet
通讯作者：
S. Watanabe;A. Tsuruta;K. Miyake;J. Flouquet
影响因子：
1.7
作者：
S. Watanabe;A. Tsuruta;K. Miyake;J. Flouquet
通讯作者：
S. Watanabe;A. Tsuruta;K. Miyake;J. Flouquet
三维拓扑近藤绝缘体中的磁和拓扑转变
影响因子：
3.5
作者：
Li Huan;Wang Zhi-Yong;Zheng Xiao-Jun;Liu Yu;Zhong Yin
通讯作者：
Zhong Yin
DOI：
10.1088/0953-8984/18/6/021
发表时间：
2005-11
期刊：
Journal of Physics: Condensed Matter
影响因子：
--
作者：
J. Derr;G. Knebel;G. Lapertot;B. Salce;M. Measson;J. Flouquet
通讯作者：
J. Derr;G. Knebel;G. Lapertot;B. Salce;M. Measson;J. Flouquet
影响因子：
8.6
作者：
KOTLIAR, G;RUCKENSTEIN, AE
通讯作者：
RUCKENSTEIN, AE