A new compound, NaMnSbO_4, represents a square net of magnetic Mn^2+ ions residing in vertex-shared oxygen octahedra. Its static and dynamic magnetic properties were studied using magnetic susceptibility, specific heat, magnetization, electron spin resonance (ESR), nuclear magnetic resonance (NMR) and density functional calculations. Thermodynamic data indicate an establishment of the long-range magnetic order with T_N ~ 44 K, which is preceded by a short-range one at about 55 K. In addition, a non-trivial wasp-waisted hysteresis loop of the magnetization was observed, indicating that the ground state is most probably canted antiferromagnetic. Temperature dependence of the magnetic susceptibility is described reasonably well in the framework of 2D square lattice model with the main exchange parameter J = -5.3 K, which is in good agreement with density functional analysis, NMR and ESR data.

中文翻译：

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S = 52二维方格锑酸盐NaMnSbO4中的磁性有序性

一种新的化合物NaMnSbO_4表示存在于共享顶点的氧八面体中的磁性Mn ^ 2 +离子的方网。使用磁化率，比热，磁化强度，电子自旋共振（ESR），核磁共振（NMR）和密度泛函计算研究了其静态和动态磁性能。热力学数据表明在T_N〜44 K时建立了远距离磁阶，然后在约55 K处出现了短程磁阶。此外，还观察到了磁化的非平常的黄蜂腰滞回线，表明基态很可能是反铁磁倾斜的。在主要交换参数J = -5.3 K的2D方格模型框架中，磁化率的温度依赖性得到了很好的描述。