He Yusheng et al 1990 J. Phys.: Condens. Matter 2 1841 doi:10.1088/0953-8984/2/7/015
He Yusheng, Lin Sihan, Xiang Jiong, He Aisheng, Zhang Jincang, Chang Fanggao, Wei Chongde, Shen Zhaohui, Hu Jiankai and Zhang Qianlin
Show affiliationsUltrasonic anomalies near 200 K in single-phase (Bi1-xPbx)2Sr2CanCun+1O2n+6+y (x=0-0.2, n=1, 2) superconducting samples were observed by velocity and attenuation measurements of both longitudinal and transverse sound waves. The remarkable isothermal-like anomalous changes near 200 K indicate that there are possible structural changes or phase transitions in the samples. On comparison with YBa2Cu3O7-y, the different behaviours in ultrasonic anomalies are attributed to the differences in structure. It is suggested, however, that the lattice instability appearing near T approximately=2Tc may be a common feature of the existing superconducting perovskites and may have some relation to their high Tc.
74.25.Ld Mechanical and acoustical properties, elasticity, and ultrasonic attenuation
Issue 7 (19 February 1990)
He Yusheng et al 1990 J. Phys.: Condens. Matter 2 1841
Akiji Yamamoto 2008 Sci. Technol. Adv. Mater. 9 013001
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