Abstract
The magnetic and transport properties of a single crystal of Pr 0.7Ca 0.3MnO 3 annealed by various magnetic fields were investigated by dc and ac magnetization measurements. The ordered Pr moment is almost absent in zero-field magnetization but is clearly observed when the sample was measured after annealing with a magnetic field. The Pr moment is enhanced when the annealing field is increased. Remarkably, the ordered Pr spins appear to induce colossal magnetoresistance (∼10 10%) as well as a metal–insulator (M–I) transition in Pr 0.7Ca 0.3MnO 3. This unique behavior is discussed in terms of the reorientation of Pr spins that are strongly coupled with the neighboring Mn spins.
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