Abstract
A step-like increase of the acoustic absorption (Q-1) is found in La 2-x Sr x CuO 4 (x = 0.019, 0.025, 0.032 and 0.064) below the temperature (Tg) at which NQR and μSR measurements evidenced the formation of a cluster spin-glass (CSG) state. The sharp maxima appearing in the 139 La NQR and μSR relaxation rates indicate the slowing down of antiferromagnetic fluctuations below the measuring frequency (107-108 Hz in those experiments). The acoustic absorption does not appear to be due to the freezing of magnetic fluctuations, for which one expects a narrow peak; rather, it is attributed to the size change of the antiferromagnetically correlated clusters, produced through magnetoelastic coupling by the vibration stress.
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