Physical Properties of Nano-crystalline Sm${}_2$CoMnO${}_6$: structure, magnetism, spin-phonon coupling and dielectric study

Abstract

Structural, magnetic, and dielectric properties of Sm${}_2$CoMnO${}_6$ have been studied. X-ray diffraction and Rietveld analysis show that the sample crystallizes in the monoclinic structure with \textit{P2${}_1$/n} space group. Magnetic study shows that the sample undergoes a paramagnetic to ferromagnetic phase transition around $T_c$ $\sim$148 K and a low-temperature ordering of Sm${}^{3+}$ moments. Temperature-dependent Raman study shows spin-phonon coupling present in this material. Dielectric response of Sm${}_2$CoMnO${}_6$ shows strong frequency dependence with large dispersion and large dielectric constant. Deviated from ideal Debye's model is found in impedance spectroscopy. Further, the activation energy obtained from tangent loss and complex impedance suggests that the relaxation process is due to electron hopping. AC conductivity has been studied to understand the conduction mechanism. The detailed analysis of AC conductivity shows that quantum mechanical tunneling of charges is involved in the conduction mechanism. The exponent obtained from AC conductivity measurements confirms the non-Debye's nature of Sm${}_2$CoMnO${}_6$.

arXiv comment16 pages, 15 figures. arXiv admin note: substantial text overlap with arXiv:1909.10590, arXiv:2003.07872

References in corpus (13)

• Scattering Continuum and Possible Fractionalized Excitations in $\alpha$-RuCl${}_3$
• Near room-temperature colossal magnetodielectricity and multiglass properties in partially-disordered La2NiMnO6
• Multiferroic behavior in the new double-perovskite Lu${}_2$MnCoO${}_6$
• Anisotropic magnetic properties and giant rotating magnetocaloric effect in double-perovskite Tb2CoMnO6
• Magnetic behavior, Griffiths phase and magneto-transport study in 3$d$ based nano-crystalline double perovskite Pr${}_2$CoMnO${}_6$
• Electronic and Magnetic Properties of the Candidate Magnetocaloric-Material Double Perovskites La${}_2$MnCoO${}_6$, La${}_2$MnNiO${}_6$ and La${}_2$MnFeO${}_6$
• Electronic and Magnetic Properties of double-perovskites La${}_2$MnRuO${}_6$ and Hole-Doped La${}_2$MnFeO${}_6$ and their Potential for Magnetic Refrigeration
• Hidden relationship between the electrical conductivity and the Mn 2p core-level photoemission spectra in La1-xSrxMnO3
• Effect of Cu${}^{2+}$ substitution in Spin-Orbit Coupled Sr${}_2$Ir${}_{1-x}$Cu${}_x$O${}_4$: Structure, magnetism and electronic properties
• Physical properties in nano-crystalline Ho${}_2$CoMnO${}_6$
• Spin-phonon coupling in hole-doped pyrochlore iridates Y${}_2$(Ir${}_{1-x}$Ru${}_x$)${}_2$O${}_7$: A Raman scattering study
• Critical behavior and magnetocaloric effect in ferromagnetic nano-crystalline Pr${}_2$CoMnO${}_6$
• Unusual layered order and charge disproportionation in double perovskite Ca2FeMnO6

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