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Rodriguez, E., J. Luzuriaga, M. NÃºÃ±ez Regueiro, and C. Fainstein. "Low temperature internal friction peak in high Tc superconductors." Solid State Communications 77, no. 10 (1991): 777–780.
Abstract: We measure the internal friction Q-1 in YBa2Cu3O7-x and Bi2Sr2CaCu2O8+x samples. At temperatures near 35 K for KHz frequencies we observe an attenuation peak. In the case of YBa2Cu3O7-x, assuming a thermally activated relaxation behaviour, we are able to show that it corresponds to the same process as other peaks observed at higher frequencies. For Bi2Sr2CaCu2O8+x this is not the case, and the origin of the peak, found in all the measured samples, remains unknown.