论文标题
高磁场中Alfe2b2的磁截图
Magnetostriction of AlFe2B2 in High Magnetic Fields
论文作者
论文摘要
使用新型X射线衍射仪的实验能力，在NHMFL的25个特斯拉佛罗里达拆分线圈磁铁上可用，塔拉哈西（Tallahassee）对多晶Alfe2B2的磁截图进行了广泛的研究。 The magnetostriction was measured near the ferromagnetic transition temperature (Curie temperature TC = 280 K, determined via DC magnetization measurements), namely, at 250, 290, and 300 K. AlFe2B2 exhibits an anisotropic change in lattice parameters as a function of magnetic field near the Curie temperature, and a monotonic variation as a function of applied field has been observed, i.e., the C轴显着增加，而A轴和B轴随着TC附近的磁场的增加而减小，而与测量温度无关。体积磁截图随着温度降低并在TC上改变其符号而降低。非偏振和自旋（铁磁）模型的密度功能理论计算证实，由于自旋极化而观察到的晶格参数的变化与实验一致。磁截图的关系是根据简化的Landau模型估算的，该模型与实验结果非常吻合。
Using the experimental capability of the novel X-ray diffraction instrument available at the 25 Tesla Florida Split Coil Magnet at the NHMFL, Tallahassee we present an extensive investigation on the magnetostriction of polycrystalline AlFe2B2. The magnetostriction was measured near the ferromagnetic transition temperature (Curie temperature TC = 280 K, determined via DC magnetization measurements), namely, at 250, 290, and 300 K. AlFe2B2 exhibits an anisotropic change in lattice parameters as a function of magnetic field near the Curie temperature, and a monotonic variation as a function of applied field has been observed, i.e., the c-axis increases significantly while the a- and b-axes decrease with the increasing field in the vicinity of TC, irrespective of the measurement temperature. The volume magnetostriction decreases with decreasing temperature and changes its sign across TC. Density functional theory calculations for the non-polarized and spin-polarized (ferromagnetic) models confirm that the observed changes in lattice parameters due to spin polarization are consistent with the experiment. The relationships for magnetostriction are estimated based on a simplified Landau model that agrees well with the experimental results.
