Incommensurate magnetism in K$_2$MnS$_{2-x}$Se$_x$ and prospects for tunable frustration in a triangular lattice of pseudo-1D spin chains

Ankita Bhutani; Piush Behera; Rebecca D. McAuliffe; Huibo Cao; Ashfia Huq; Melanie J. Kirkham; Clarina dela Cruz; Toby Woods; Daniel P. Shoemaker

doi:10.1103/PhysRevMaterials.3.064404

paper

Incommensurate magnetism in K $_{2}$ MnS $_{2 - x}$ Se $_{x}$ and prospects for tunable frustration in a triangular lattice of pseudo-1D spin chains

arXiv:1905.03318 · doi:10.1103/PhysRevMaterials.3.064404

Abstract

We report the first detailed investigation of K $_{2}$ MnS $_{2}$ and K $_{2}$ MnSe $_{2}$ from the K $_{2}$ MnS $_{2}$ structure type and their magnetic solid solution K $_{2}$ MnS $_{2 - x}$ Se $_{x}$ and find that compounds of this structure type consist of strongly-coupled pseudo-one-dimensional antiferromagnetic chains that collectively represent a frustrated two-dimensional triangular antiferromagnet. Bulk samples of K $_{2}$ MnS $_{2 - x}$ Se $_{x}$ with $0 \leq x \leq 2$ are characterized using X-ray diffraction, neutron diffraction, magnetization and heat capacity measurements. An incommensurate cycloid magnetic structure with a magnetic propagation vector $k = [0.58 01]$ is observed for all samples in K $_{2}$ MnS $_{2 - x}$ Se $_{x}$ , and the ordering is robust despite a 12\% increase in cell volume. Geometric frustration of chains results in incommensurability along $a$ and a two-step magnetic transition. The varying geometries accessible in compounds of this structure type are presented as promising avenues to tune frustration.

8 pages, 11 figures

Incommensurate magnetism in K2​MnS2−x​Sex​ and prospects for tunable frustration in a triangular lattice of pseudo-1D spin chains

Abstract

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Incommensurate magnetism in K $_{2}$ MnS $_{2 - x}$ Se $_{x}$ and prospects for tunable frustration in a triangular lattice of pseudo-1D spin chains