Physical properties in nano-crystalline Ho${}_2$CoMnO${}_6$

Abstract

3$d$ based double perovskite materials have received much attention in recent years due to their exotic magnetic structure and magneto-electric coupling. In this work we have prepared and studied the nano-crystalline sample of Ho${}_2$CoMnO${}_6$. Structural, magnetic, Raman and dielectric properties have been studied in detail. The structural analysis shows that the sample crystallize in monoclanic crystal structure with $\textit{P2$_1$/n}$ phase group. The X-ray photoelectron spectroscopy have been employed to confirms the charge state of cations presents in the material. Magnetic study shows that the sample undergoes a paramagnetic to ferromagnetic phase transition around $T_c$ $\sim$85 K. The isothermal magnetization measurements shows hysteresis curve hence confirm ferromagnetic behavior at low temperature. Temperature dependent Raman study reveals that there is spin phonon coupling in the sample marked by deviation in phonon mode from anharmonic behavior. Dielectric response of Ho${}_2$CoMnO${}_6$ shows the large dispersion and large dielectric constant. Impedance spectroscopy and electrical modulus study reveal that system shows deviation from ideal Debye model. AC conductivity have been studied as a function of both temperature and frequency. We found that the conduction mechanism is obeyed by Jonscher's model. The exponent factor $n$ is suggest that the material deviates from ideal Debye model.

arXiv comment13 pages, 17 figures

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Cited by in corpus (5)

• Spin-phonon coupling and dielectric spectroscopy in nano-crystalline Pr${}_2$CoMnO${}_6$ double perovskite manganite
• Physical Properties of Nano-crystalline Sm${}_2$CoMnO${}_6$: structure, magnetism, spin-phonon coupling and dielectric study
• Structure, magnetic and dielectric properties in nano-crystalline Yb${}_2$CoMnO${}_6$
• 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
• 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