Abstract The structural and magnetic properties of the rare-earth transition metal compound DyFe11.4Nb0.6 have been investigated over its magnetically order state by variable temperature high resolution synchrotron x-ray diffraction (85 K - 650 K) together with ac magnetic susceptibility (10 K - 300 K), DC magnetization (300 K - 600 K) and heat capacity (2 K - 300 K) measurements. The magnetic ordering temperature has been determined to be TC = 538(5) K while with decreasing temperature, two spin reorientations have been detected around Tsr1 = 265(±5 K) and Tsr2 = 140(±5) K. The Debye temperature θD = 412(±10) K derived from the specific heat measurements of DyFe11.4Nb0.6 agrees well with the values reported for related compounds, while the density of states at the Fermi level was found to be N(EF) = 3.8 ev−1 atom−1. Refinements of the synchrotron x-ray diffraction patterns indicate the occurrence of magnetoelastic couplings at all three magnetic transitions, the Curie temperature TC and spin reorientation temperatures Tsr1 and Tsr2. The linear thermal expansion has been determined over the temperature range 85 K - 650 K and substantial magneto-volume effects shown to persist at temperatures up to 596 K, significantly above the Curie temperature. Similarly, the spontaneous volume magnetostriction ωs of DyFe11.4Nb0.6 extends to 1.17 TC, well above the Curie temperature TC = 538(5) K. The spontaneous volume magnetostriction has the value ωs = 1.08 × 10−2 at 85 K. The properties of such materials offer potential for applications in functional structures.

中文翻译：

---

DyFe11.4Nb0.6 中的磁弹性耦合

摘要 通过变温高分辨率同步辐射 X 射线衍射 (85 K - 650 K) 和交流磁化率，研究了稀土过渡金属化合物 DyFe11.4Nb0.6 在其磁有序状态下的结构和磁性能。 10 K - 300 K)、直流磁化 (300 K - 600 K) 和热容量 (2 K - 300 K) 测量。磁有序温度已确定为 TC = 538(5) K，而随着温度的降低，在 Tsr1 = 265(±5 K) 和 Tsr2 = 140(±5) K 附近检测到两个自旋重定向。 德拜温度 θD = 412(±10) K 来自 DyFe11.4Nb0.6 的比热测量值与相关化合物报告的值非常吻合，而费米能级的态密度为 N(EF) = 3.8 ev− 1 个原子−1。同步加速器 X 射线衍射图的细化表明在所有三个磁转变、居里温度 TC 和自旋重定向温度 Tsr1 和 Tsr2 处都发生了磁弹性耦合。已在 85 K - 650 K 的温度范围内确定了线性热膨胀，并且显示出显着的磁体积效应在高达 596 K 的温度下持续存在，明显高于居里温度。类似地，DyFe11.4Nb0.6 的自发体积磁致伸缩 ωs 扩展到 1.17 TC，远高于居里温度 TC = 538(5) K。自发体积磁致伸缩在 85 K 时具有值 ωs = 1.08 × 10−2。这种材料的特性为功能结构中的应用提供了潜力。