Influence of Dzyaloshinskii-Moriya interactions on magnetic structure of a spin-1/2 deformed kagome lattice antiferromagnet

被引：10

作者：

Hwang, Kyusung ^{[1
]}

Park, Kwon ^{[2
]}

Kim, Yong Baek ^{[1
,2
]}

机构：

[1] Univ Toronto, Dept Phys, Toronto, ON M5S 1A7, Canada

[2] Korea Inst Adv Study, Sch Phys, Seoul 130722, South Korea

来源：

PHYSICAL REVIEW B | 2012年 / 86卷 / 21期

基金：

新加坡国家研究基金会; 加拿大自然科学与工程研究理事会;

关键词：

D O I：

10.1103/PhysRevB.86.214407

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Motivated by the recent neutron-scattering experiment on Rb2Cu3SnF12 [Nature Phys. 6, 865 (2010)], we investigate the effect of Dzyaloshinskii-Moriya interactions in a theoretical model for the magnetic structure of this material. Considering the valence bond solid ground state, which has a 12-site unit cell, we develop the bond operator mean-field theory. It is shown that the Dzyaloshinskii-Moriya interactions significantly modify the triplon dispersions around the Gamma point and cause a shift of the spin-gap (the minimum triplon gap) position from the K to Gamma point in the first Brillouin zone. The spin gap is also evaluated in exact diagonalization studies on a 24-site cluster. We discuss a magnetic transition induced by the Dzyaloshinskii-Moriya interactions in the bond operator framework. Moreover, the magnetization process under external magnetic fields is studied within the exact diagonalization approach. We find that the results of both approaches are consistent with the experimental findings. DOI: 10.1103/PhysRevB.86.214407

引用

页数：10

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