Phase Separation and the Low-Field Bulk Magnetic Properties of Pr0.7Ca0.3MnO3

Details Phase Separation and the Low-Field Bulk Magnetic Properties of Pr0.7Ca0.3MnO3 Phase Separation and the Low-Field Bulk Magnetic Properties of Pr0.7Ca0.3MnO3

2000-12-08

arxiv.org/abs/cond-mat/0012143v1

Physics

Condensed Matter

Strongly Correlated Electrons

15 pages with figures, submitted to Physical Review B

Scientific paper

10.1103/PhysRevB.63.172408

We present a detailed magnetic study of the perovskite manganite Pr0.7Ca0.3MnO3 at low temperatures including magnetization and a.c. susceptibility measurements. The data appear to exclude a conventional spin glass phase at low fields, suggesting instead the presence of correlated ferromagnetic clusters embedded in a charge-ordered matrix. We examine the growth of the ferromagnetic clusters with increasing magnetic field as they expand to occupy almost the entire sample at H ~ 0.5 T. Since this is well below the field required to induce a metallic state, our results point to the existence of a field-induced ferromagnetic insulating state in this material.

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