论文标题
Y1-Xerxfe2（H，d）4.2化合物中元磁过渡的起源
Origin of the metamagnetic transitions in Y1-xErxFe2(H,D)4.2 compounds
论文作者
论文摘要
The structural and magnetic properties of Y1-xErxFe2 intermetallic compounds and their hydrides and deuterides Y1-xErxFe2H(D)4.2 have been investigated using X-ray diffraction and magnetic measurements under static and pulsed magnetic field up to 60 T. The intermetallics crystallize in the C15 cubic structure , whereas corresponding hydrides and deuterides crystallize in a monoclinic structure.所有化合物均显示晶胞体积与ER浓度的线性减小。与具有相同ER含量的氘化的甲状腺相比，氢化物的细胞体积大0.8％。它们在低场和温度下是铁磁性的，金属间的补偿点为x = 0.33，氢化物和氘化的X = 0.57。在TFM-AFM的加热时，氢化物和氘化的加热时，观察到尖锐的一阶铁磁抗磁磁性（FM-AFM）转变。这些化合物显示了两种不同类型的场引起的过渡，它们具有不同的物理起源。在低温（t <50 K）时，观察到与btrans1 = 8 t的强制铁磁性磁磁过渡，与ER矩方向的变化相关，观察到与平行Fe矩的变化有关。 Btrans1对ER浓度，温度和同位素效应不敏感。还观察到了由抗铁磁到铁磁状态引起的第二个元磁过渡。过渡场BTRANS2与温度相比增加，并与Fe Sublattice的巡回电子元磁行为有关。通过在零场上推断TFM-AFM（B）来获得发作温度TM0。 TM0与ER含量相比，与相应的氘化相比，氢化物的降低与ER含量相比，氢化物高45（5）k。 TM0与细胞体积的演变表明，它不能仅归因于纯体积效应，也应考虑电子效应。
The structural and magnetic properties of Y1-xErxFe2 intermetallic compounds and their hydrides and deuterides Y1-xErxFe2H(D)4.2 have been investigated using X-ray diffraction and magnetic measurements under static and pulsed magnetic field up to 60 T. The intermetallics crystallize in the C15 cubic structure , whereas corresponding hydrides and deuterides crystallize in a monoclinic structure. All compounds display a linear decrease of the unit cell volume versus Er concentration; the hydrides have a 0.8% larger cell volume compared to the deuterides with same Er content. They are ferrimagnetic at low field and temperature with a compensation point at x = 0.33 for the intermetallics and x = 0.57 for the hydrides and deuterides. A sharp first order ferromagnetic-antiferromagnetic (FM-AFM) transition is observed upon heating at TFM-AFM for both hydrides and deuterides. These compounds show two different types of field induced transitions, which have different physical origin. At low temperature (T < 50 K), a forced ferri-ferromagnetic metamagnetic transition with Btrans1 = 8 T, related to the change of the Er moments orientation from antiparallel to parallel Fe moment, is observed. Btrans1 is not sensitive to Er concentration, temperature and isotope effect. A second metamagnetic transition resulting from antiferromagnetic to ferrimagnetic state is also observed. The transition field Btrans2 increases linearly versus temperature and relates to the itinerant electron metamagnetic behavior of the Fe sublattice. An onset temperature TM0 is obtained by extrapolating TFM-AFM (B) at zero field. TM0 decreases linearly versus the Er content and is 45(5) K higher for the hydrides compared to the corresponding deuteride. The evolution of TM0 versus cell volume shows that it cannot be attributed exclusively to a pure volume effect and that electronic effects should also be considered.
