Field-tunable quadruple- states driven by momentum-space frustration
arXiv:2606.22133 · doi:10.5488/cmp.29.23705
Abstract
Multiple- magnetism in itinerant electron systems enables complex spin crystals and noncoplanar textures even in centrosymmetric settings. We study a minimal momentum-space spin model on a square lattice with four symmetry-related ordering wave vectors, including bilinear and biquadratic interactions under an out-of-plane magnetic field. Using simulated annealing, we obtain the field-dependent phase diagram and identify successive transitions among single-, double-, and multiple inequivalent quadruple- states. The quadruple- manifold exhibits rich internal structures: the states sharing the same wave vectors differ in phase locking, amplitude distribution, and noncoplanarity, leading to distinct real-space textures and scalar spin chirality patterns. Our results demonstrate that momentum-space frustration and biquadratic coupling provide an efficient route to stabilizing diverse quadruple- spin crystals, offering a general framework for higher-order spin textures in centrosymmetric itinerant magnets.
arXiv comment21 pages, 18 figures
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