Structure, magnetic and dielectric properties in nano-crystalline Yb${}_2$CoMnO${}_6$

Abstract

Structural, magnetic and dielectric properties have been studied for Yb${}_2$CoMnO${}_6$. Nano-crystalline sample of Yb${}_2$CoMnO${}_6$ synthesized by sol-gel method and structural analysis shows that the sample crystallizes in monoclinic crystal structure with \textit{P2${}_1$/n} phase group. To understand the charge state of Co, Mn and Yb we have performed the XPS study. Magnetic study shows that the sample undergoes a paramagnetic to ferromagnetic phase transition around $T_c$ $\sim$56 K and an additional magnetic ordering at a lower temperature around 14 K due to ordering of Yb${}^{3+}$ magnetic ions. Temperature dependent Raman study reveals that spin-phonon interaction is present in this material. Further, we have studied the dielectric properties of this material. We observed that the material shows a relaxation behavior that obeys the thermally activated relaxation mechanism. Impedance spectroscopy reveals that the material shows non-Debye's behavior. AC conductivity study is performed to understand the conduction mechanics which involve the quantum mechanical tunneling phenomenon.

11 pages, 15 figures

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Cited by in corpus (1)

• Interface magnetic coupling and magnetization dynamic of La${}_{2/3}$Sr${}_{1/3}$MnO${}_3$ single layer and (La${}_{2/3}$Sr${}_{1/3}$MnO${}_3$/SrRuO${}_3$)${}_n$ (n = 1, 5) superlattice on SrTiO${}_3$(001) substrate