Abstract
The longitudinal ultrasonic velocity ( V l), as well as resistivity has been measured in single-phase polycrystalline La 1/3Sr 2/3Fe 1− x Co x O 3 ( x = 0, 0.025, 0.075, 0.10, 0.15) at a frequency of 10 MHz, from 20 to 300 K. It is found that with increasing Co content, the resistivity decreases and the charge ordering transition temperature T CO shifts to lower temperature. For all samples, upon cooling down from 300 K, a substantial softening in V l above T CO and dramatic stiffening below T CO are observed, which implies extremely strong electron–phonon coupling in this system. Below T CO, another softening in V l is observed for x = 0, which is attributed to the breathing-type distortion of Fe–O octahedron. With Co doping, this anomaly weakens and finally disappears for x = 0.15. This behavior suggests that the charge disproportionation (CD) transition is suppressed by the Co substitution.
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