论文标题
抑制高磁场的磁相变和纳米 - 晶状体GD $ _2 $ comno $ _6 $的非debye的性质：物理特性的细节研究
Suppression of magnetic phase transition at high magnetic field and non-Debye's nature of nano-crystalline Gd$_2$CoMnO$_6$: a detail study of physical properties
论文作者
论文摘要
本文介绍了纳米晶状体GD $ _2 $ comno $ _6 $的结构，磁化，声子行为和介电响应。研究表明，材料以$ \ textit {p2 $ _1 $/n} $相位组的单斜晶体结构的相位组结晶。 XPS测量表明co $^{2+} $，Mn $^{4+} $氧化状态存在于样本中。磁化研究表明，样品经历了Co $^{2+} $和Mn $^{4+} $磁性IONS的铁磁顺序，左右$ T_C $ $ \ sim $ 132K。但是，我们已经看到，随着外部磁场的应用，相位过渡的应用很大程度上受到抑制。拉曼研究揭示了GD $ _2 $ comno $ _6 $中的Spin-Phonon耦合。介电研究表明，样品在中频范围内显示出较大的介电常数和强分散。介电损失表明材料中存在两个放松时间，这些弛豫时间不同，并且由热激活的松弛力学驱动。此外，Nyquist图和交流电导率研究表明，该样本本质上是非debye的。
Structural, magnetization, phonon behavior, and dielectric response of nano-crystalline Gd$_2$CoMnO$_6$ have been presented in this paper. The study shows that the material crystallizes in $\textit{P2$_1$/n}$ phase group of the monoclinic crystal structure. XPS measurement shows Co$^{2+}$ and Mn$^{4+}$ oxidation states are present in the sample. Magnetization study reveals that the sample undergoes a ferromagnetic ordering of Co$^{2+}$ and Mn$^{4+}$ magnetic ions around $T_c$ $\sim$132 K. However we have seen that with the application of external magnetic field the phase transition is largely suppressed. Raman study reveals the presence spin-phonon coupling in Gd$_2$CoMnO$_6$. Dielectric study reveals that the sample shows large dielectric constant and strong dispersion in mid frequency range. The dielectric loss shows there are two relaxation processes present in the material with different relaxation time and which are driven by thermally activated relaxation mechanics. Further, the Nyquist plot and AC conductivity study show that this sample is non-Debye's in nature.
