Charge Transport and Ultrasonic Properties of La_1/3Sr_2/3Fe_0.95Co_0.05O₃Perovskite

Abstract:

The longitudinal ultrasonic velocity (V) and attenuation at a frequency of 10MHz have been measured in single-phase polycrystalline La1/3Sr2/3Fe0.95Co0.05O3 from 20K to 300K. The temperature dependence of resistivity indicates that La1/3Sr2/3Fe0.95Co0.05O3 undergoes charge ordering transition at TCO. A dramatic increase in V is observed at TCO, which is accompanied by a sharp peak in attenuation. This simultaneous occurrence of resistivity and ultrasonic anomalous features implies extremely strong electron-phonon interaction, which is due to the the Jahn-Teller effect of high-spin Fe4+. Below TCO, another softening in V accompanied by a wide ultrasonic attenuation peak is observed. The analysis of the results suggests that these anomalies may correspond to the breathing-type distortion of Fe-O octahedron.

• Periodical: Advanced Materials Research (Volumes 482-484)
• Pages: 819-823
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.482-484.819
• Online since: February 2012
• Authors: Hui Kong, Wei Dai, Shuai Shao
• Keywords: Oxide Materials, Rare Earth Compounds, Ultrasonic

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