Journal
JOURNAL OF APPLIED PHYSICS
Volume 115, Issue 12, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.4869662
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Funding
- Fundamental Research Funds for the Central Universities
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
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The nature of charge disproportionation in orthorhombic lanthanum orthoferrites La1-xCaxFeO3-delta (x = 0.4 and 0.5) has been investigated by kilohertz mechanical spectroscopy. Contrast to rhombohedral La1-xSrxFeO3-delta (x = 0.5), no elastic softening was observed in La1-xCaxFeO3-delta above charge disproportionation. This different behavior of elastic modulus in La1-xCaxFeO3-delta and La1-xSrxFeO3-delta unveils the implicit orbital effect. Below charge disproportionation, an internal friction peak around 140 K was observed in La1-xCaxFeO3-delta, which is similar to that in La1-xSrxFeO3-delta. This peak is ascribed to an elastic manifestation of charge freezing and can be used as an indirect indication of CD in doped LaFeO3. (C) 2014 AIP Publishing LLC.
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