Anomalous Spin Response in Non-centrosymmetric Compounds

Abstract

We examine static spin susceptibilities ${\chi }_{\alpha \beta }(\mathbf{q})$ of spin components $S_{\alpha }$ and $S_{\beta }$ in the non-centrosymmetric tetragonal system. These show anomalous momentum dependences like ${\chi }_{xx}(\mathbf{q})-{\chi }_{yy}(\mathbf{q})\sim q_x^2-q_y^2$ and ${\chi }_{xy}(\mathbf{q})+{\chi }_{yx}(\mathbf{q})\sim q_x{q}_y$, 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.

4 pages, 1 table, 4 figures

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• Strongly parity-mixed superconductivity in Rashba-Hubbard model
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• Magnetic-field enhanced aniferromagnetism in non-centrosymmetric heavy-fermion superconductor CePt${}_3$Si
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• Delocalization of charge and current in a chiral quasiparticle wave-packet