Abstract
Ultrasonic, vibrating-reed, and specific-heat measurements in the new high-Tc superconductor YBCO are analysed showing glasslike dynamics over 7 orders of magnitude in frequency, from 1 Hz to 10 MHz. The relaxation time seems to diverge towards T0 = 210 K with an approximate value of the effective dynamic exponent vz ≈ 8. This value is typical for glass systems. We suggest that the observed behaviour is caused by an intrinsic structural instability related to the oxygen vacancies, with dynamics dominated by random fields or glasslike behaviour.
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