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Ultrasonic studies of the spin-state transition and the local distortion in LaCoO3

Zhang Shi-Long Kong Hui Cen Cheng Su Jin-Rui Zhu Chang-Fei

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Ultrasonic studies of the spin-state transition and the local distortion in LaCoO3

Zhang Shi-Long, Kong Hui, Cen Cheng, Su Jin-Rui, Zhu Chang-Fei
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  • Temperature dependence of longitudinal and transverse ultrasonic velocities and attenuations of the single-phase polycrystalline LaCoO3 were presente d. A clear softening in the longitudinal ultrasonic velocity accompanied by a sharp peak in attenuation were observed near the spin-state transition temperature(≈90K), which did not appear in the transverse mode measurement. This anomalous ultraso nic behavior further demonstrates that the spin-state transition of Co3+ ions in LaCoO3 near 90K are more likely from a low spin state (LS,t62ge 0g) to an intermediate spin state (IS,t5 2ge1g ) than to a high s pin state (HS,t42ge2g ). A b ig attenuation peak accompanied by a slight softening in velocity was observed near 200K in both longitudinal and tr ansverse modes, which was probably caused by the relaxation of the local distort ions originating from Jahn-Teller effect of the randomly distributed IS state Co 3+ ions.
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Publishing process
  • Received Date:  21 July 2004
  • Accepted Date:  19 January 2005
  • Published Online:  20 September 2005

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