Abstract
We have employed the technique of electron spin resonance (ESR) for studying the Dy-doping effects on the magnetic state of La 0.7− x Dy x Sr 0.3MnO 3 with x=0.35, 0.40 and 0.45. The results of temperature-dependent linewidth, gyromagnetic factor ( g-factor), double-integrated intensity (DIN) and their correlation with transport property are presented. It is found that with increasing Dy-content, the ferromagnetic phase is suppressed, driving the samples of x=0.35 and 0.40 to a spin-disorder state with a reduced magnetic transition temperature and possibly to a spin-glass state for x=0.45. Furthermore, the linewidth increases and g-factor decreases with increasing Dy-content, implying that the exchange coupling strength of Mn 3+–Mn 4+ is reduced with increasing Dy-doping.
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