Abstract
It has not been investigated adequately whether a quantum-mechanical nature can persist in a classical magnetic long-range order in systems with large spins. The recent experimental study reports a quantum-mechanical 1/3 magnetization plateau at greater than 2 T and a classical canted antiferromagnetic long-range order in weak magnetic fields in ${\text{SrMn}}_{3}{\text{P}}_{4}{\text{O}}_{14}$ possessing spin 5/2 [Yang et al., Inorg. Chem. 47, 2562 (2008)]. The origins of the plateau are quantum-mechanical discrete energy levels of magnetic eigenstates. Although the spin system of ${\text{SrMn}}_{3}{\text{P}}_{4}{\text{O}}_{14}$ is inferred to be a trimerized spin chain, the magnetism has not been explained quantitatively. We have conducted high-field magnetization measurements of ${\text{SrMn}}_{3}{\text{P}}_{4}{\text{O}}_{14}$ powders and determined that the spin system is a spin-5/2 trimer with weak three-dimensional intertrimer interactions. This spin system can account for the magnetization plateau and magnetic long-range order.
Published Version
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