Abstract
La 1 − x Sr x Co O 3 (0<x⩽0.5) have been thoroughly studied by means of dc magnetization, ac susceptibilities, and electron-spin-resonance (ESR) spectra. Spin-glass behavior and its transition process for x<0.2 compositions appeared to occur at temperature Tg ranging from 14.6to68K, whereas for further strontium substitution the system was characterized by growing ferromagnetic clusters. The frequency dependence of the spin-glass freezing temperature Tf has been analyzed using the conventional critical slowing-down scaling law. The temperature dependence of Ta with respect to the external magnetic field Hex obeyed an exponential function of θa=Ta∕TC∝−Hexn. A complete magnetic phase diagram of La1−xSrxCoO3 is drawn up. Besides, the internal dynamics in the samples are elucidated by the ESR spectra. The results obtained provide more insights into the nature of spin dynamics and so-called magnetic frustration phenomena in such a cobaltate system.
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