Magnetic and transport properties of La0.5Sr0.5(FexCo1−x)O3 (0 ≤ x ≤ 0.2) perovskites

Phan, The‐Long; Huynh, T.N.; Phan, Manh‐Huong; Khiem, Nguyen Van; Phuc, N.X.; Chung, Yoo Seung; Rhee, J.R.; Yu, Seong Cho

doi:10.1002/pssb.200304588

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“…for the samples, which is probably symptomatic of ferromagnets with a strong anisotropy field. The magnetic moment of spins in the FM clusters could be frozen in directions energetically favored by their local anisotropy or by an external magnetic field when the system is cooled down from high temperature with or without a magnetic field, respectively [9][10][11]. As a result, our magnetic experimental data are in good agreement with those of earlier works [1 -3].…”

Section: Methodssupporting

confidence: 93%

ESR study of Sr‐doped LaCoO₃ cobaltites

Phan

Bau

Khiem

et al. 2005

Physica Status Solidi (b)

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PACS 71.38.Ht, 76.30.Kg The electron spin resonance (ESR) method was used to investigate the internal spin dynamics of La 1-x Sr x CoO 3 (x = 0.1, 0.2, 0.3) compounds in the temperature range 170 to ~500 K. ESR spectra of the samples over the whole temperature range studied could be divided into three regions corresponding to different linewidths. This is due to the presence of an anisotropic field arising from ferromagnetic clusters. This is similar to manganite perovskites. The peak-to-peak ESR linewidth vs. temperature, ∆H pp (T), for the samples has a minimum value at a temperature T min (in this case T min ≈ 1.7T C , whereas T min ≈ 1.1T C for manganites). Asymmetric Lorentzian ESR spectra at temperatures T < T min become Gaussian at T > T min . ESR signals of La 1-x Sr x CoO 3 cobaltites are thermally damped out at ~460 K, this value being much lower than that for manganite compounds. The explanation of the experimental ∆H pp (T) data in the T > T min regime is based on the one-phonon process and adiabatic hopping motion of small polarons.

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Section: Methodssupporting

confidence: 93%