Syntheses, Structures, and Magnetic Properties of New Geometrical Frustrated Magnet with S = 1/2 Triangular Lattice Kco(Po3)3

Abstract

We report the single crystal growth and magnetic properties on the hexagonal structure compound KCo(PO3)3, where magnetic ions Co2+ are located on the triangular-lattice within the ab-plane and stacked in the “AAA” type fashion along c-axis. Compared to the intralayer nearest neighboring distance dintra=6.6161 Å, the shorter Co2+-Co2+ interlayer distance dinter = 4.8940 Å establish that KCo(PO3)3 can be considered as a quasi-one dimensional with triangular-lattice coexist system. The magnetic and specific heat measurements indicates that KCo(PO3)3 single crystal exhibit a long range magnetic order with TN ~ 2.8 K and easy-axis magnetic anisotropy, which has saturated magnetic moments Ms = 2.36 μB/Co2+ for field (H) along c-axis and Ms = 1.96 μB/Co2+ for H // ab-plane. In combination with the magnetic susceptibility and the ESR results of KCo(PO3)3 single crystal, the different magnetic frustration parameters and Landé g factor further supports the magnetic anisotropic behaviors, where f ≈ 17.15 and g = 4.96 for H // ab-plane and f ≈ 2.04 and g = 4.34 for H // c-axis. Our magnetic study on KCo(PO3)3 pave the way to explore the quantum magnetic phases in the triangular lattice magnet with 1D spin chain competition.

Keywords: KCo(PO3)3 single crystal, Geometric frustration, Triangular lattice, 1D spin chain, Antiferromagnetic, magnetic anisotropy