On the Magnetism of Mn- and Co-Ammonium Tutton Salts at Very Low Temperatures
On the Magnetism of Mn- and Co-Ammonium Tutton Salts at Very Low Temperatures
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极低温下锰和钴铵塔顿盐的磁性
DOI：
10.1143/jpsj.16.2139
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发表时间：
1961
影响因子：
1.7
通讯作者：
N. Uryǔ
中科院分区：
文献类型：
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作者：
N. Uryǔ
讨论了锰、钴离子的塔顿铵盐中的寄生铁磁性。通过假设两个子格模型，我们寻找了自旋方向的最低能态，其中考虑了交换和偶极相互作用。结果表明，MnNH4-Tutton盐的寄生铁磁性来源于晶场，而ConNH4-Tutton盐的寄生铁磁性来源于各向异性偶极相互作用和交换作用。估算出Mn-和Co-NH4-Tutton盐的自旋倾角分别为21°42‘和10°42’，与实验结果吻合较好。理论上，最低能态的自旋方向位于倾斜K1K3平面的平面内，其倾角分别为-15°2‘和-9°53’。Neel温度和磁化率的计算结果也与实测值吻合较好。值得注意的是，与m相对应的方向。
The parasitic ferromagnetism found in the ammonium tutton salt of Mn and Co ions is discussed. By assuming the two sublattice model, we look for the lowest energy state of spin direction, where the exchange and dipole interactions are taken into account. It can be shown that the origin of parasitic ferromagnetism in MnNH 4 -tutton salt is the crystalline field and in CoNH 4 -tutton salt the anisotropic dipolar and exchange interactions. The estimate of the angle with which the spins incline to the K 1 K 2 -plane are found to be 21°42' and 10°42' for Mn- and Co–NH 4 -tutton salts respectively, agreeing well with the experimental results, It appears theoretically that the spin direction for the lowest energy state lie within a plane which inclines to the K 1 K 3 -plane with angle -15°2' and -9°53' for Mn- and Co-tutton salts respectively. The Neel temperature and the susceptihilities are also calculated in rather good agreement with the measured values. It is noted that the directions corresponding to the m...