Variation of ultrasonic behaviors in R1/3Sr2/3FeO3 (R=La, Pr, Gd)

  title={Variation of ultrasonic behaviors in R1/3Sr2/3FeO3 (R=La, Pr, Gd)},
  author={Hui Kong and Changfei Zhu},
The longitudinal ultrasonic velocity (V), as well as resistivity and magnetization has been measured in polycrystalline R1/3Sr2/3FeO3 (R=La, Pr, Gd). When the R-site ion is changed from La to smaller-size R ion, the charge ordering (CO) transition shifts to lower temperature and finally disappears for R=Gd. Dramatic anomalies in V for the R=La, Pr compounds are observed near the CO transition temperature, which implies the electron-phonon coupling arising from the Jahn-Teller effect of Fe4… CONTINUE READING