Polarized Raman spectroscopic study and investigation of phonon modes of Co3(VO4)2 at variable thermodynamic conditions

Kesari, Swayam; Rao, Rekha; Balakrishnan, G.

doi:10.1016/j.solidstatesciences.2024.107449

Cited by 2 publications

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“…Martin et al and Kesari et al reported high-pressure vibrational and structural behaviors of Ni 3 V 2 O 8 and Co 3 V 2 O 8 orthovanadates by means of x-ray diffraction (XRD), Raman spectra, and theoretical simulations. The high-pressure powder XRD measurements confirmed the structure stability of the Co 3 V 2 O 8 system for pressure as high as 20 GPa [21,22].…”

Section: Introductionmentioning

confidence: 88%

Magnetic exchange interactions and non-Debye relaxation in spin-3/2 frustrated Kagomé magnet Co₃V₂O₈

Singh,

Skoulatos,

Joshi

et al. 2024

J. Phys.: Condens. Matter

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We report the experimental determination of the magnetic exchange parameter (J/kB = 2.88 ± 0.02 K) for the Spin-3/2 ferromagnetic (FM) Kagomé lattice system: Co3V2O8 using the temperature dependence of dc-magnetic susceptibility χ(T) data by employing the fundamental Heisenberg linear chain model. Our results are quite consistent with the theoretically reported nearest neighbor dominant FM exchange coupling strength Jex-NN ∽ 2.45 K. Five different magnetic phase transitions (6.2-11.2 K) and the spin-flip transition (9.6-7.7 kOe) have been probed using the ∂(χT)/∂T vs. T, heat capacity (CP-T) and differential isothermal magnetization curves. Among such sequence of transitions, the prominent ones being incommensurate antiferromagnetic (AFM) state at 11.2K, commensurate AFM state at 8.8 K, and commensurate FM state across 6.9 K. All the successive magnetic phase transitions have been mapped onto a single H-T plane through which one can easily distinguish the above-mentioned different phases. The magnetic contribution of the CP-T near TN has been analyzed using the power-law expression CM = A|T − TN|−α resulting in the critical exponent α = 0.18 ± 0.01 (0.15 ± 0.003) for T < TN (T > TN), respectively for the Co3V2O8. It is interesting to note that non-Debye type dipole relaxation is quite prominent in Co3V2O8 and was evident from the Kohlrausch-Williams-Watts analysis of complex modulus and impedance spectra (0≤β≤1). Mott’s variable-range hopping of charge carriers process is evident through the resistivity analysis (ρac‒T −1/4) in the temperature range 275−350°C. Moreover, the frequency-dependent analysis of σac(ω) follows Jonscher's power law yielding two distinct activation energies (Ea~0.37 and 2.29 eV) between the temperature range 39 − 99°C and 240 − 321°C.

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Section: Introductionmentioning

confidence: 88%

Magnetic exchange interactions and non-Debye relaxation in spin-3/2 frustrated Kagomé magnet Co₃V₂O₈

Singh,

Skoulatos,

Joshi

et al. 2024

J. Phys.: Condens. Matter

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High-pressure polymorph of Co₃P₂O₈: phase transition to an olivine-related structure

Turnbull,

Sánchez Martín,

Liang

et al. 2024

Dalton Trans.

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Polarized Raman spectroscopic study and investigation of phonon modes of Co3(VO4)2 at variable thermodynamic conditions

Cited by 2 publications

References 45 publications

Magnetic exchange interactions and non-Debye relaxation in spin-3/2 frustrated Kagomé magnet Co₃V₂O₈

Magnetic exchange interactions and non-Debye relaxation in spin-3/2 frustrated Kagomé magnet Co₃V₂O₈

High-pressure polymorph of Co₃P₂O₈: phase transition to an olivine-related structure

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Polarized Raman spectroscopic study and investigation of phonon modes of Co3(VO4)2 at variable thermodynamic conditions

Cited by 2 publications

References 45 publications

Magnetic exchange interactions and non-Debye relaxation in spin-3/2 frustrated Kagomé magnet Co3V2O8

Magnetic exchange interactions and non-Debye relaxation in spin-3/2 frustrated Kagomé magnet Co3V2O8

High-pressure polymorph of Co3P2O8: phase transition to an olivine-related structure

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Magnetic exchange interactions and non-Debye relaxation in spin-3/2 frustrated Kagomé magnet Co₃V₂O₈

Magnetic exchange interactions and non-Debye relaxation in spin-3/2 frustrated Kagomé magnet Co₃V₂O₈

High-pressure polymorph of Co₃P₂O₈: phase transition to an olivine-related structure