On the correlation of the magnetic properties with the structural parameters in Fe-doped europium chromite
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2021
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In the present work, the dynamics of the spins and the structural parameters of thermal treated samples of Eu1−xFexCrO3 (x = 0, 0.1 and 0.2)
were investigated. The ac-magnetic susceptibility (χac) was measured near TN for frequencies (f ) in the range 10 - 104 Hz, magnitude of the ac
magnetic field of 10 Oe and for 5 ≤ T ≤ 300 K. X-ray diffraction data were used for determining the lattice parameters and the bonding angle θB
(Cr– O(2) – Cr) for 100 ≤ T ≤ 300 K. The maximum in χac was found to shift to higher values of T for increasing values of f . The Vogel-Fulcher
law was used for analyzing χac yielding values for the characteristic relaxation time τ0, activation energy Ea/kB and glassy temperature TG,
respectively, in the ranges 2.10 - 3.96 ps, 46.5 - 47.2K and 169.9 -176.1 K. The super-exchange parameter J ∼ cos4[(180 − θB)/2]/d7, where d
is the length of the bound Cr-O(2), was also obtained yielding a good correlation with the corresponding values of TN.
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RATKOVSKI, D. R.; MARÍN RAMÍREZ, J. M.; FRANÇA, E. L. T.; FRANCO JR., A.; MACHADO, F. L. A. On the correlation of the magnetic properties with the structural parameters in Fe-doped europium chromite. AIP Advances, New York, v. 11, n. 3, e035205, 2021. DOI: https://doi.org/10.1063/9.0000010. Disponível em: https://aip.scitation.org/toc/adv/11/3?windowStart=50&size=50. Acesso em: 6 abr. 2023.