BaNa 2 Co 7 Te 3 O 18 with a distorted 2-uniform lattice (T13) showing unusual magnetic behaviors.

Search for transition-metal compounds with unique spin lattices is a great challenge. Herein, we report on a successful exploration of a new compound BaNa 2 Co 7 Te 3 O 18 , featuring a unique spin network of (3 6 ; 3 4 , 6) 2 -like lattice (T13), which is a typical example with distorted 2-uniform lattices. Magnetic measurements show that this compound has large magnetic anisotropy with an easy magnetization c -axis, while an unusually large magnetization loop can be observed in the magnetization curve. Furthermore, no λ-like peaks are observed in the heat capacity data, showing partial long-range order in the system, which is in good agreement with the theoretical prediction.