Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2002-12-17
Phys. Rev. lett. 90, 207204(2003)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages and 6 figures; text revised and additional information added for fig. 3 and a slight modification for fig. 5
Scientific paper
10.1103/PhysRevLett.90.207204
We have investigated the physical effects of the Dzyaloshinskii-Moriya (DM) interaction in copper benzoate. In the low field limit, the spin gap is found to vary as $H^{2/3}\ln ^{1/6}(J/\mu_BH_s)$ ($H_s$: an effective staggered field induced by the external field $H$)in agreement with the prediction of conformal field theory, while the staggered magnetization varies as $H^{1/3}$ and the $\ln^{1/3}(J/\mu_BH_s)$ correction predicted by conformal field theory is not confirmed.The linear scaling relation between the momentum shift and the magnetization is broken. We have determined the coupling constant of the DM interaction and have given a complete quantitative account for the field dependence of the spin gaps along all three principal axes, without resorting to additional interactions like interchain coupling. A crossover to strong applied field behavior is predicted for further experimental verification.
Su Zhao-Bin
Wang Xiao Qian
Xiang Tao
Yu Lu
Zhao Jian-Zhou
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