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Electron Spin Resonance Spectra of {\hbox {La}}_{0.7}{\hbox {Cd}}_{0.3}({\hbox {Mn}},{\hbox {Co}}){\hbox {O}}_{3} Perovskites

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4 Author(s)
Phan, T.L. ; Dept. of Phys., Chungbuk Nat. Univ., Cheongju, South Korea ; Thanh, T.D. ; Phan, M.H. ; Yu, S.C.

We have prepared two perovskite samples La0.7Cd0.3MnO3 (LCMO) and La0.7Cd0.3CoO3 (LCCO) by using a solid-state reaction technique and studied their electron spin resonance (ESR) spectra versus temperature up to ~500 K. Experimental results reveal that as compared to LCMO, the resonant signals of LCCO are weaker and easily extinguished by thermal energy. For both samples, there exists a temperature called Tmin at which the narrowest ESR linewidth (ΔH) is obtained. At temperatures , the resonant lines associated with the ferromagnetic phase are asymmetrical. They become a symmetrical single line in the Lorentzian shape when the samples enter the paramagnetic region with T > Tmin. A detailed analysis of resonant spectra in this paramagnetic region reveals that temperature dependences of ΔH can be described by a linear function of the single-phonon process. The resonant intensity versus temperature obeys an exponent function I = I0 exp(Ea/kBT), where Ea is the activation energy associated with decomposition of ferromagnetic clusters. Temperature dependences of the resonant position (Hr) and the Lande factor (g) indicate the dominance of spin-spin and spin-lattice interactions in both LCMO and LCCO, but with the additional presence of the spin-orbit interaction in LCCO at high temperatures (T > 380 K). We believe that the differences in the electronic structure of eg and tg levels, as well as in the electronic spin configuration of Mn and Co ions, caused the distinct difference in the ESR spectra of LCMO and LCCO.

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Magnetics, IEEE Transactions on  (Volume:50 ,  Issue: 1 )