Antiferromagnetism of the Spinel MnGa2O4
Antiferromagnetism of the Spinel MnGa2O4
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DOI：
10.1063/1.1708538
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发表时间：
1966-03
影响因子：
3.2
通讯作者：
B. Boucher;A. Herpin;A. Oleś
中科院分区：
文献类型：
--
作者：
B. Boucher;A. Herpin;A. Oleś
立方尖晶石MnGa2O4是部分逆晶，87%的Mn原子位于四面体A位上。粉末的中子衍射表明，在低温下，a位上的自旋矩是反铁磁耦合的（TN=33°K）。（200）磁反射随磁场的变化可以确定磁矩沿[111]的方向和各向异性常数的值（K1= - 4.104 erg/cm3）。1/χ(T)曲线在尼尔点不显示典型的最小值，而是在低温下迅速下降。我们通过考虑八面体上自旋的顺磁性来解释这一现象。
The cubic spinel MnGa2O4 is partially inverse with 87% of the Mn atoms on tetrahedral A sites. Neutron diffraction with a powder has shown that, at low temperatures, the spin moments on A sites are antiferromagnetically coupled (TN=33°K). The variation of the (200) magnetic reflection as a function of the magnetic field allows the determination of both the direction of the magnetic moments along [111] and the value (K1=−4.104 erg/cm3) of the anisotropy constant. The 1/χ(T) curve does not show the typical minimum at the Neel point but instead decreases rapidly at low temperatures. We explain that phenomenon by taking into account the paramagnetism of the spins on octahedral sites.