Abstract:
It is established that the magnetic state of the anion-deficient La$_{0.70}$Sr$_{0.30}$MnO$_{2.85}$ manganite represents the spin-glass state of the cluster. The magnetic field at the beginning ($H <$ 10 kOe) leads to the fragmentation of ferromagnetic clusters, then ($H >$ 10 kOe) leads to the transition to a ferromagnetic state of an antiferromagnetic matrix and to increase in the degree of polarization of local spins of manganese. It is determined that the freezing temperature of magnetic moments varies as $T_f$ = 65-6$H^{0.21}$. The causes and mechanism of the magnetic phase separation are discussed.
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