Abstract
The manganites Nd0.43Sr0.57MnO3 and Nd0.35Sr0.65MnO3, with A-type and C-type antiferromagnetic orders, respectively, are prepared and their physical properties are studied by electrical resistivity, ac∕dc susceptibility, and electron spin resonance (ESR) measurements. Results of the temperature dependent ESR linewidth suggest that the spin-spin interaction is the dominant relaxation mechanism in these layered manganites. The g factors are nearly temperature independent in the paramagnetic state, but it varies dramatically near TN, indicating a strong spin-orbit coupling near the transition. Different temperature-dependencies of g factor in these two samples reflect the distinct features in the layer∕chain antiferromagnetism.
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