Effects of internal structural parameters on the properties of Ba-substituted La{sub 0.5}Sr{sub 0.5}MnO{sub 3}
- Physics Department, Northern Illinois University, DeKalb, Illinois 60115 (United States)
- Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439 (United States)
A series of barium substituted La{sub 0.5}Sr{sub 0.5-x}Ba{sub x}MnO{sub 3} materials has been synthesized and investigated using neutron powder diffraction. We show that Ba substitution suppresses the low-temperature orbital ordering that has been previously observed in La{sub 0.5}Sr{sub 0.5}MnO{sub 3}, and demonstrate the evolution of the magnetic and nuclear structures as a function of increasing Ba content. All our samples exhibit paramagnetic and ferromagnetic properties near room temperature with the ferromagnetic structures described as I4/mc{sup '}m{sup '} and P4/mm{sup '}m{sup '} for x=0, 0.1, and 0.2 and x=0.3, 0.4, and 0.5, respectively. The Mn magnetic moments align ferromagnetically in the direction of the c axis with no evidence for any spin canting. The effects of A-site ionic size, size variance, and strains in the lattice on the ferromagnetic ordering temperature, T{sub C}, are discussed and compared with other members of the general La{sub 0.5}(Ca,Sr,Ba){sub 0.5}MnO{sub 3} series. Depending on the substitution path, the relationship between T{sub C} and <r{sub A}> is either near constant or looks like an inverted parabola. Finally, details of the magnetic, resistive, structural, and interatomic properties are presented.
- OSTI ID:
- 20853754
- Journal Information:
- Physical Review. B, Condensed Matter and Materials Physics, Vol. 74, Issue 14; Other Information: DOI: 10.1103/PhysRevB.74.144415; (c) 2006 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 1098-0121
- Country of Publication:
- United States
- Language:
- English
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