The symmetric and antisymmetric superexchange interactions in spin-Peierls system
Liu Hai-Lian(刘海莲)a)b), Wang Zhi-Guo(王治国)c), Yang Cheng-Quan(杨成全)a), Huang Xian-Shan(黄仙山)b), and Shi Yun-Long(石云龙)a)c)†
a Institute of Solid State Physics, Shanxi Datong University, Datong 037009, China; b School of Mathematics and Physics, Anhui University of Technology, Maanshan 243002, China; c Pohl Institute of Solid State Physics, Tongji University, Shanghai 200092, China
Abstract The influences of Dzyaloshinskii--Moriya (DM) interaction and Kaplan--Shekhtman--Entinwohlman--Aharony (KSEA) interaction on the dimerization of a spin-Peierls system are investigated theoretically by using the Lanczos numerical method. The ground state of the spin-Peierls system is still dimerized phase when both of the DM and the KSEA interactions have the same value with Heisenberg interaction. It is found that the KSEA interaction and uniform DM interaction are always against systemic dimerization, but the staggered DM interaction acts in favour of dimerization. Furthermore, the influences of the DM and the KSEA interactions are also studied in terms of the ground state index rate and the energy gap index rate of the dimerized Heisenberg system. The results show that the DM interaction makes the index rates larger, while the KSEA interaction makes them smaller.
(Magnetic phase boundaries (including classical and quantum magnetic transitions, metamagnetism, etc.))
Fund: Project supported by the High Technology Research Program of Higher Education Institution of Shanxi Province (Grant No~200611037) and the Youth Science Research Program of Shanxi Datong University (Grant No~2006Q05).
Cite this article:
Liu Hai-Lian(刘海莲), Wang Zhi-Guo(王治国), Yang Cheng-Quan(杨成全), Huang Xian-Shan(黄仙山), and Shi Yun-Long(石云龙) The symmetric and antisymmetric superexchange interactions in spin-Peierls system 2007 Chinese Physics 16 3858
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