skip to main content

SciTech ConnectSciTech Connect

Title: Charge disproportionation in La{sub 1-x}Ca{sub x}FeO{sub 3−δ} (x = 0.4 and 0.5) investigated by mechanical spectroscopy

The nature of charge disproportionation in orthorhombic lanthanum orthoferrites La{sub 1-x}Ca{sub x}FeO{sub 3-δ} (x = 0.4 and 0.5) has been investigated by kilohertz mechanical spectroscopy. Contrast to rhombohedral La{sub 1-x}Sr{sub x}FeO{sub 3-δ} (x = 0.5), no elastic softening was observed in La{sub 1-x}Ca{sub x}FeO{sub 3-δ} above charge disproportionation. This different behavior of elastic modulus in La{sub 1-x}Ca{sub x}FeO{sub 3-δ} and La{sub 1-x}Sr{sub x}FeO{sub 3-δ} unveils the implicit orbital effect. Below charge disproportionation, an internal friction peak around 140 K was observed in La{sub 1-x}Ca{sub x}FeO{sub 3-δ}, which is similar to that in La{sub 1-x}Sr{sub x}FeO{sub 3-δ}. This peak is ascribed to an elastic manifestation of charge freezing and can be used as an indirect indication of CD in doped LaFeO{sub 3}.
Authors:
; ; ;  [1]
  1. National Laboratory of Solid State Microstructures and School of Physics, Nanjing University, Nanjing 210093 (China)
Publication Date:
OSTI Identifier:
22271133
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Applied Physics; Journal Volume: 115; Journal Issue: 12; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CALCIUM COMPOUNDS; CONCENTRATION RATIO; DOPED MATERIALS; ELASTICITY; ELECTRIC CHARGES; FERRITES; INTERNAL FRICTION; LANTHANUM COMPOUNDS; ORTHORHOMBIC LATTICES; OXIDATION; REDUCTION; SPECTROSCOPY; TRIGONAL LATTICES; YOUNG MODULUS