Volume 85, Number 2, January 2009
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||30 January 2009|
Torque anomalies at magnetization plateaux in quantum magnets with Dzyaloshinskii-Moriya interactions
Institute of Theoretical Physics, École Polytechnique Fédérale de Lausanne - CH-1015 Lausanne, Switzerland
Corresponding author: firstname.lastname@example.org
Accepted: 5 January 2009
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 SrCu2(BO3)2.
PACS: 75.10.Jm – Quantized spin models / 75.10.Pq – Spin chain models / 75.30.Gw – Magnetic anisotropy
© EPLA, 2009
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