Observation of helimagnetism in the candidate ferroelectric CrI
arXiv:2310.12120 · doi:10.1103/PhysRevB.109.144403
Abstract
CrI is a quasi-one dimensional (1D) van der Waals (vdW) system that exhibits helimagnetism that propagates along the ribbons. This was determined from neutron time-of-flight diffraction measurements. Below K, a screw-like helimagnetic order develops with an incommensurate wavevector of at 8 K. Using density functional theory (DFT) calculations, the - model was leveraged to describe the helimagnetism, where and correspond, respectively, to a ferromagnetic nearest neighbor (NN) and antiferromagnetic next-nearest neighbor (NNN) intrachain interaction. The DFT calculations predict that bulk CrI in the orthorhombic crystal structure satisfies the condition, which favors formation of helimagnetic order.
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