Observation of the cluster spin-glass phase in La_{2-x}Sr_{x}CuO_{4} by   anelastic spectroscopy
  An increase of the acoustic absorption is found in La_{2-x}Sr_{x}CuO_{4} (x = 0.019, 0.03 and 0.06) close to the temperatures at which freezing of the spin fluctuations in antiferromagnetic-correlated clusters is expected to occur. The acoustic absorption is attributed to changes of the sizes of the quasi-frozen clusters induced by the vibration stress through magnetoelastic coupling. 
F. Cordero (1), R. Cantelli (2), A. Paolone (2) and M. Ferretti (3)   ((1) CNR, Ist. Acustica, Roma, and INFM, Italy, (2) Un...