Negative magnetization of Li2Ni2Mo3O12: A spin system composed of distorted honeycomb lattices and linear chains

作者：Hase Masashi^*; Pomjakushin Vladimir Yu; Sikolenko Vadim; Keller Lukas; Luetkens Hubertus; Doenni Andreas; Kitazawa Hideaki

来源：Physical Review B, 2011, 84(10): 104402.

DOI：10.1103/PhysRevB.84.104402

We study the magnetism of a spin-1 substance Li2Ni2Mo3O12. The spin system consists of distorted honeycomb lattices and linear chains of Ni2+ spins. Li+ ions enter about 25% and 50% of the honeycomb and chain Ni sites, respectively, creating disorder in both spin subsystems. A magnetic phase transition occurs at T-c = 8.0 K in the zero magnetic field. In low magnetic fields, the magnetization increases rapidly below T-c, decreases below 7 K, and finally becomes negative at low temperatures. We determine the magnetic structure using neutron-powder- diffraction results. The honeycomb lattices and linear chains show antiferromagnetic and ferromagnetic long-range order, respectively. We investigate static and dynamic magnetic properties using the local probe technique of muon spin relaxation. We discuss the origin of the negative magnetization.

• 出版日期2011-9-1