This article investigates the magnetic susceptibility, χ(T), of the two-phase (R32 + C2/c) crystal LaCr3(BO3)4 in the temperature range 2–300 K for two orientations of an external magnetic field. It has been established that both structural modifications of lanthanum chromium borate are ordered antiferromagnetically, with each of them having its own Neel temperature (6.5 and 8.5 K). It has been shown that at T > 60 K, the magnetic susceptibility is well described by the Curie–Weiss law with an effective magnetic moment of μeff = 3.86 μB/Cr3+ and a Curie–Weiss temperature of θ = –23 K. Within the Heisenberg spin chain model, taking into account the interchain exchange interaction, the authors have obtained the following exchange-interaction constants: an antiferromagnetic intrachain exchange (J/k = 4.8 K) and a ferromagnetic interchain exchange (J'/k = –0.28 K).

中文翻译：

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LaCr3(BO3)4晶体的磁性

本文研究了两相 (R32 + C2/c) 晶体 LaCr3(BO3)4 在 2–300 K 温度范围内对于外部磁场的两个方向的磁化率 χ(T)。已经确定，镧铬硼酸盐的两种结构改性都是反铁磁性有序的，它们中的每一个都有自己的尼尔温度（6.5 和 8.5 K）。已经表明，在 T > 60 K 时，磁化率由居里-魏斯定律很好地描述，有效磁矩为 μeff = 3.86 μB/Cr3+，居里-魏斯温度为 θ = –23 K。海森堡自旋链模型，考虑到链间交换相互作用，作者得到如下交换相互作用常数：一个反铁磁链内交换（J/k = 4.