Anomalous ferromagnetic spin fluctuations in an antiferromagnetic insulator Pr1-xCaxMnO3
Abstract
The high temperature paramagnetic state in an antiferromagnetic (AFM) insulator Pr1-xCaxMnO3 is characterized by the ferromagnetic (FM) spin fluctuations with an anomalously small energy scale. The FM fluctuations show a precipitous decrease of the intensity at the charge ordering temperature TCO, but persist below TCO, and vanish at the AFM transition temperature TN. These results demonstrate the importance of the spin ordering for the complete switching of the FM fluctuation in doped manganites.
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