Title: Ultrasonic investigation of thermally assisted flux flow in (La1−Sr )2CuO4 ceramics
Abstract: We measured the change in the ultrasonic attenuation coefficient Δα(T, H) and sound velocity ΔVs(T, H) with temperature T and magnetic field H for (La1−xSrx)2CuO4 (x=0.075) ceramic samples. While both Δα(H) and ΔVs(H) varied ∝Hn(n∼1.6) at a temperature T=4.2 K, no difference was observed in the ΔVs(H) versus H curves between the cases of H∥K and H‖K (K: polarization vector of sound waves), and the theory of Pankert. Furthermore, the plots of α(T, 10T)−α(T, 0T) versus T showed a broad peak at T∼30 K accompanied by a broad step in the Vs(T, 10T)−Vs(T, 0T) versus T curve. Although the peak could be attributed to energy dissipation due to thermally assisted flux flow, the width of the peak was much larger than the prediction of the theory. Here, we adopted the intrinsic pinning model proposed by Tachiki et al. for the explanation of the discrepancies with the theory.
Publication Year: 1991
Publication Date: 1991-04-01
Language: en
Type: article
Indexed In: ['crossref']
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Cited By Count: 14
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