Ultrasonic Study on Jahn-Teller Distortions in La1=3Sr2=3CoO3 |
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| Authors: | Jian-xing Yi Hui Kong Chang-fei Zhu |
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| Affiliation: | Laboratory of Advanced Functional Materials and Devices, Department of Materials Science and Engi-neering, University of Science and Technology of China, Hefei 230026, China,Laboratory of Advanced Functional Materials and Devices, Department of Materials Science and Engi-neering, University of Science and Technology of China, Hefei 230026, China,Laboratory of Advanced Functional Materials and Devices, Department of Materials Science and Engi-neering, University of Science and Technology of China, Hefei 230026, China |
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| Abstract: | The longitudinal ultrasonic velocity (Vl), attenuation (ffl), magnetization and resistivity of single phase polycrystalline La1=3Sr2=3CoO3 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 Vl softens conspicuously at beginning and reaches a minimum at 120 K. After that the Vl 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 Co3+. |
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| Keywords: | La1=3Sr2=3CoO3 Ultrasonic velocity and attenuation Jahn-Teller e?ect |
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