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Magnetism and the Verwey transition in Fe_3O_4 under pressure

机译:Fe_3O_4中的磁性和Verwey转变在压力下

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We have used high precision neutron diffraction and ab initio calculations to investigate the behavior of the magnetism of spinel magnetite (Fe_3O_4) under pressure in the 0-10 GPa range and at temperatures of 130-300 K. We find a significant but continuous decrease of the magnetic moments at both the A and B sites to at least 10 GPa, as well as an absence of any detectable pressure dependence of the oxygen atomic parameter. The data indicate a very weak dependence of the saturation moment on pressure and temperature and rule out unambiguously a transition from inverse to normal spinel in the P/ T range investigated. Consequently, charge ordering cannot be precluded as the origin of the Verwey transition under pressure.
机译:我们已经使用高精度中子衍射和从头算计算来研究尖晶石磁铁矿(Fe_3O_4)在0-10 GPa压力和130-300 K温度下的磁性行为。 A和B位置的磁矩都至少达到10 GPa,并且氧原子参数没有任何可检测到的压力依赖性。数据表明饱和矩对压力和温度的依赖性非常弱,并且明确地排除了在研究的P / T范围内从尖晶石到正尖晶石的转变。因此,不能排除电荷排序作为压力下Verwey过渡的起源。

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