On the ferromagnetism of AlFe2B2
On the ferromagnetism of AlFe2B2
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DOI：
10.1016/j.jmmm.2011.03.008
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发表时间：
2011-08
影响因子：
2.7
通讯作者：
M. ElMassalami;D. D. S. Oliveira-D.;H. Takeya
中科院分区：
文献类型：
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作者：
M. ElMassalami;D. D. S. Oliveira-D.;H. Takeya
根据广泛的穆斯堡尔效应(ME)和磁化强度测量，正交AlFe2B2被表征为铁磁(FM)，因为这一特征是明显的：在更高的温度下具有居里-魏斯行为，在TC=320K开始FM转变，特征磁化等温线低于Tc。在液氦温度下，磁化强度饱和到μSat≈1μBPER Fe原子；这个值是铁金属报告的值的一半，表明相对更填充的3D带。ME分析表明，超精细场H(0)为88(2)Koe，异质素位移值(相对于Fe)为0.50(2)mm/S，四极参数为0.02 mm/S：所有参数外推至零开尔文。我们将讨论磁矩的巡回特性。
Based on extensive Mossbauer effect (ME) and magnetization measurements, the orthorhombic AlFe2B2was characterized as a ferromagnet (FM) because this character is evident as: a Curie–Weiss behavior at higher temperatures, an onset of a FM transition at Tc=320K, and characteristic magnetizations isotherms below Tc. At liquid helium temperatures, the magnetization saturates to μsat≈1μBper Fe atom; a value which is half the one reported for the iron metal indicating a relatively more filled 3d band. The ME analysis revealed a hyperfine field H(0) of 88(2)kOe, an isomer shift (relative to Fe) of 0.50(2)mm/s, and a quadrupole parameter of 0.02mm/s: all parameters extrapolated to zero Kelvin. The itinerant character of the magnetic moment will be discussed.