Structure, magnetic and dielectric properties in nano-crystalline Yb2CoMnO6

Structural, magnetic and dielectric properties have been studied for Yb2CoMnO6. Nano-crystalline sample of Yb2CoMnO6 synthesized by sol–gel method and structural analysis shows that the sample crystallizes in monoclinic crystal structure with P21/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 Tc ∼56 K and an additional magnetic ordering at a lower temperature around 14 K due to ordering of Yb3+ 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.