Abstract
The influence of photoillumination on the magnetic and transport properties of epitaxial thin films of the manganite Pr0.6La0.1Ca0.3MnO3 is investigated. It is found that illuminating films with He–Ne laser light increases their magnetization and decreases their electric resistance, stimulating an antiferromagnetic-insulator—ferromagnetic-metal phase transition, which is observed in this crystal in a magnetic field at low temperatures. It is shown that the phase-transition field is appreciably lower after the films are photoilluminated. It is concluded that photoillumination gives rise to the formation and growth of ferromagnetic metallic clusters inside an antiferromagnetic insulating phase. The mechanism of the effect of light on the magnetic and electric states of the manganite Pr0.6La0.1Ca0.3MnO3 could be related with photoinduced electron transfer from Mn3+ to Mn4+ ions, which results in melting of the charge ordering present in this manganite in the antiferromagnetic insulating state, and gives rise to a transition of the crystal into a ferromagnetic metallic phase.
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