Mössbauer Effect Probe of Local Jahn-Teller distortion in Fe-doped Colossal Magnetoresistive Manganites

Abstract

Local structure of the Fe-doped La${}_{1-x}$Ca${}_x$MnO${}_3$ (x=0.00-1.00) compounds has been investigated by means of Mössbauer spectroscopy. ${}^{57}$Fe 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 La${}_{1-x}$Ca${}_x$MnO${}_3$ colossal magnetoresistive perovskites.

3 figures, will appear in Applied Physics Letters