Abstract
Phonon echoes are observed in the amorphous superconductor CuZr2 (Tc=2.4 K) in the vortex state at 10 mK. The phase-memory time T2 of the tunnelling states and their relaxation time T1 are measured at 10 mK. The latter is also obtained from a saturation-recovery experiment. T1 and T2 vary exponentially as a function of magnetic field between 0 and 5 kOe. This effect is explained by considering an interaction between the tunnelling states and the vortices that arise from the normal-electron density distribution near the vortex core.
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