Distinct insulating state below the curie point in Pr{sub 0.7}Ba{sub 0.3}MnO{sub 3}.
Magnetization, resistivity, thermal expansion, thermopower, and neutron powder diffraction data are presented for the perovskite manganite Pr{sub 0.7}Ba{sub 0.3}MnO{sub 3}. A distinct ferromagnetic insulating state, similar to that observed in the La{sub 0.88}Sr{sub 0.12}MnO{sub 3} system, is observed in the temperature range between the paramagnetic-ferromagnetic transition at TFM{approx}180 K and the broad metal-insulator transition near T{sub p}=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.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC; NSF; OUS
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 949666
- Report Number(s):
- ANL/MSD/JA-43106
- Journal Information:
- Phys. Rev. B, Journal Name: Phys. Rev. B Journal Issue: Jun. 1, 2002 Vol. 65; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- ENGLISH
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