Mössbauer Effect Probe of Local Jahn-Teller distortion in Fe-doped Colossal Magnetoresistive Manganites
Zhao-hua Cheng, Zhi-hong Wang, Nai-li Di, Zhi-qi Kou, Guang-jun Wang, Rui-wei Li, Yi Lu, Qing-an Li, Bao-gen Shen, R. A. Dunlap
Abstract
Local structure of the Fe-doped La1-xCaxMnO3 (x=0.00-1.00) compounds has been investigated by means of Mössbauer spectroscopy. 57Fe Mössbauer spectra provide a direct evidence of Jahn-Teller distortion in these manganites. On the basis of Mössbauer results, the Jahn-Teller coupling was estimated. It is noteworthy that Ca-concentration dependence of Jahn-Teller coupling strength is very consistent with the magnetic phase diagram. Our results reveal that Mössbauer spectroscopy can not only detect the local structural distortion, but also provide a technique to investigate Jahn-Teller coupling of Fe-doped La1-xCaxMnO3 colossal magnetoresistive perovskites.
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