BaNa2Co7Te3O18 with a distorted 2-uniform lattice (T13) showing unusual magnetic behaviors

Abstract

Search for transition-metal compounds with unique spin lattices is a great challenge. Herein, we report on a successful exploration of a new compound BaNa₂Co₇Te₃O₁₈, featuring a unique spin network of (3₆; 3₄, 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.