Abstract
Longitudinal and shear ultrasonic velocity in Zn substituted GdBaSr(Cu 3− x Zn x )O 7− δ ( x = 0 , 0.01, 0.03, 0.06 and 0.1) superconductors have been measured using the pulsed-echo-overlap method with frequency 5–10 MHz in the temperature range of 80–300 K. An elastic anomaly characterized by a slope change was observed in the x = 0 sample in the longitudinal mode at around 220 K. This anomaly shifts towards lower temperature with increasing Zn content and vanishes when x = 0.06 and 0.1. The characteristic Debye temperature and electron–phonon coupling constant were estimated using the standard BCS theory as well as the two-dimensional van Hove scenario. The variation in the elastic behaviours upon Zn doping may be due to the effect of changes in the spin correlation at the CuO 2 planes.
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