Torque anomalies at magnetization plateaux in quantum magnets with Dzyaloshinskii-Moriya interactions

Details Torque anomalies at magnetization plateaux in quantum magnets with Dzyaloshinskii-Moriya interactions Torque anomalies at magnetization plateaux in quantum magnets with Dzyaloshinskii-Moriya interactions

2008-10-29

arxiv.org/abs/0810.5329v2

EPL 85, 27010 (2009)

Physics

Condensed Matter

Other Condensed Matter

published version

Scientific paper

10.1209/0295-5075/85/27010

We investigate the effect of Dzyaloshinskii-Moriya (DM) interactions on torque measurements of quantum magnets with magnetization plateaux in the context of a frustrated spin-1/2 ladder. Using extensive DMRG simulations, we show that the DM contribution to the torque is peaked at the critical fields, and that the total torque is non-monotonous if the DM interaction is large enough compared to the g-tensor anisotropy. More remarkably, if the DM vectors point in a principal direction of the g-tensor, torque measurements close to this direction will show well defined peaks even for small DM interaction, leading to a very sensitive way to detect the critical fields. We propose to test this effect in the two-dimensional plateau system SrCu$_2$(BO$_3$)$_2$.

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