磁电 Co4Nb2O9 的温度相关结构、介电和拉曼光谱研究,The Journal of Physical Chemistry C

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磁电 Co4Nb2O9 的温度相关结构、介电和拉曼光谱研究
The Journal of Physical Chemistry C ( IF 3.3 ) Pub Date : 2022-08-24 , DOI: 10.1021/acs.jpcc.2c03259
Satish Yadav ₁ , Mohit Chandra ₁ , R. Rawat ₁ , Ashish Khandelwal ₂ , L.S. Sharath Chandra _{2,

3} , R. J. Choudhary ₁ , Vasant Sathe ₁ , A.K. Sinha _{4,

5} , Kiran Singh ₆

Affiliation

Co ₄ Nb ₂ O ₉ (CNO)是一种有趣的磁电材料。在这里，我们报告了 CNO 与温度相关的综合结构、声子、介电和磁性。与大多数早期报告相比，即使在没有磁场的情况下，在反铁磁有序 ( T _{N ) ~27.2 K 的温度相关介电测量中也观察到了明显的转变（上升特征）。}T _N处（在零磁场中）的类似上升的特征在临界磁场之上变成一个尖峰。等温磁电介电 (MD) 结果推断磁场诱导的转变低于T _N具有非线性行为。在 80 kOe的T _N下观察到最大的 MD 效应（~4%）。在没有磁场的情况下，太赫兹测量显示出低于T _{N的自旋激发模式。}温度相关的同步加速器X射线衍射结果表明，CNO的晶体结构在12 K下仍保持P 3̅ c 1 ；然而，在T _N处观察到晶格的小变形。与温度相关的拉曼测量推断出低于T _N的光学声子的异常声子位移和线宽. 这些结果表明，即使在没有磁场的情况下，CNO 也表现出介电转变并表现出磁弹性耦合。还讨论了这些顺序参数的相关性。

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Temperature-Dependent Structural, Dielectric, and Raman Spectroscopy Studies on Magnetoelectric Co4Nb2O9

Co₄Nb₂O₉ (CNO) is one of the interesting magnetoelectric materials. Here, we report comprehensive temperature-dependent structural, phonon, dielectric, and magnetic properties of CNO. In contrast to most of the earlier reports, a clear transition (upturn feature) is observed in temperature-dependent dielectric measurements at the antiferromagnetic ordering (T_N) ∼27.2 K, even in the absence of magnetic field. The upturn-like feature at T_N (in zero magnetic field) becomes a sharp peak above the critical magnetic field. The isothermal magnetodielectric (MD) results infer magnetic field-induced transition below T_N with nonlinear behavior. The maximum MD effect (∼4%) is observed at T_N at 80 kOe. The terahertz measurements exhibit spin excitation mode below T_N in the absence of magnetic field. The temperature-dependent synchrotron X-ray diffraction results demonstrate that the crystal structure of CNO remained P3̅c1 down to 12 K; however, small distortion in the lattice is observed at T_N. The temperature-dependent Raman measurements infer an unusual phonon shift and line width of optical phonons below T_N. These results illustrate that CNO exhibits dielectric transition even in the absence of magnetic field and exhibit magnetoelastic coupling. The correlation in these order parameters is also discussed.

更新日期：2022-08-24

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