Structure, magnetic and dielectric properties in nano-crystalline Yb2CoMnO6

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 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 ∼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.