Phys. Rev. B 65, 214423 (2002) [5 pages]Distinct insulating state below the Curie point in Pr0.7Ba0.3MnO3Received 5 November 2001; revised 6 March 2002; published 5 June 2002 Magnetization, resistivity, thermal expansion, thermopower, and neutron powder diffraction data are presented for the perovskite manganite Pr0.7Ba0.3MnO3. A distinct ferromagnetic insulating state, similar to that observed in the La0.88Sr0.12MnO3 system, is observed in the temperature range between the paramagnetic-ferromagnetic transition at TFM≈180 K and the broad metal-insulator transition near Tp=120 K. The large A-site cation-size mismatch appears to suppress the ferromagnetic double-exchange interactions relative to the competing ferromagnetic superexchange interactions, thereby giving rise to the ferromagnetic insulating state. © 2002 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevB.65.214423
DOI:
10.1103/PhysRevB.65.214423
PACS:
75.30.Vn, 75.30.Et
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