科研之友
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摘要
The longitudinal ultrasonic velocity (VI), attenuation (a,), magnetization and resistivity of single phase polycrystalline La(1/3)Sr(2/3)CoO(3) were measured as a function of temperature from 20 K to 300 K. The resistivity shows metallic behavior in the whole temperature range and a kink at 235 K was observed, which coincides with the ferromagnetic transition temperature (Tc). As the temperature cools down from Tc, the V(1) softens conspicuously at beginning and reaches a minimum at 120 K. After that the V(1) dramatically stiffens below 120 K accompanied by a wide attenuation peak. The analysis of the results suggests that these ultrasonic anomalies may correspond to local lattice distortions via the Jahn-Teller effect of intermediate spin Co(3+).
- 出版日期2008-4
- 单位中国科学技术大学
