Anomalous Spin Response in Non-centrosymmetric Compounds

Details Anomalous Spin Response in Non-centrosymmetric Compounds Anomalous Spin Response in Non-centrosymmetric Compounds

2008-06-19

arxiv.org/abs/0806.3214v1

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 1 table, 4 figures

Scientific paper

10.1143/JPSJ.77.113706

We examine static spin susceptibilities $\chi_{\alpha\beta}({\bf q})$ of spin components $S_{\alpha}$ and $S_{\beta}$ in the non-centrosymmetric tetragonal system. These show anomalous momentum dependences like $\chi_{xx}({\bf q})-\chi_{yy}({\bf q})\sim q_x^2-q_y^2$ and $\chi_{xy}({\bf q})+\chi_{yx}({\bf q})\sim q_x q_y$, which vanish in centrosymmetric systems. The magnitudes of the anomalous spin susceptibilities are enhanced by the on-site Coulomb interaction, especially, around an ordering wave vector. The significant and anomalous momentum dependences of these susceptibilities are explained by a group theoretical analysis. As the direct probe of the anomalous spin susceptibility, we propose a polarized neutron scattering experiment.

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