Effects of magnetization on hole localization and MnO₆ octahedra disorder in hole-doped lanthanum manganese perovskites [electronic resource]
The authors review the distortions of the MnO₆ octahedra reduced by magnetization in hole-doped lanthanum manganese perovskites. The systems they consider include the colossal magnetoresistance (CMR) samples La{sub 1-x}Ca{sub x}MnO₃ (x = 0.21, 0.25, 0.30), La{sub 0.76}Ba{sub 0.33}MnO₃, and a poorer...
Saved in:
| Online Access: |
Online Access |
|---|---|
| Corporate Author: | |
| Format: | Government Document Electronic eBook |
| Language: | English |
| Published: |
Washington, D.C. : Oak Ridge, Tenn. :
United States. Dept. of Energy ; distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy,
1998.
|
| Subjects: |
| Summary: | The authors review the distortions of the MnO₆ octahedra reduced by magnetization in hole-doped lanthanum manganese perovskites. The systems they consider include the colossal magnetoresistance (CMR) samples La{sub 1-x}Ca{sub x}MnO₃ (x = 0.21, 0.25, 0.30), La{sub 0.76}Ba{sub 0.33}MnO₃, and a poorer quality La{sub 0.76}Pb{sub 0.33}MnO₃ sample. They also report preliminary work on three samples of oxygen-doped LaMnO{sub 3+δ and a lanthanum-deficient La{sub 0.9}MnO₃ sample. They find the same exponential relationship between the removal of the distortion and the sample magnetization in the Ba- and Pb-doped CMR samples as was found previously for the Ca doped samples. The MnO₆ distortion in the oxygen-doped materials is found to slightly reduce below the magnetic transition, although much less so than in the CMR samples. Above T{sub C}, the antiferromagnetic LaMnO{sub 3.006} sample shows a softer temperature dependence of the Mn-O bond length distribution broadening. Surprisingly, even this sample shows deviations from thermal (Debye) behavior near T{sub N}, possibly due to FM coupling within MnO planes. |
|---|---|
| Item Description: | Published through the Information Bridge: DOE Scientific and Technical Information. 12/31/1998. "LA-UR--98-2531" "CONF-9806129--" "DE99001242" Euroconference on polarons: condensation, pairing, magnetism, Erice (Italy), 9-17 Jun 1998. Brosha, E.L.; Booth, C.H.; Kwei, G.H.; Neumeier, J.J.; Bridges, F. |
| Physical Description: | 11 p. |