Mechanical Measurement Of Vortex Phase Transition In Yba2cu3o7+Delta

Using the vibrating-reed technique, the internal friction (IF) Q(-1) and modulus as functions of temperature were measured for a YBa2Cu3O7+delta single crystal at low applied magnetic fields up to 0.5 T. The frequency dependence of the IF related to the vortex is reported. No obvious shift of the IF peak position can be observed by varying the measurement frequency ranging from 10(2) to 10(3) Hz but the IF peak height satisfies a power law Q(-1)proportional to omega(-n) (1更多