4.3 Longitudinal Field: T₁ Relaxation of Mu@C₆₀

  

Figure 4.21: Single exponential relaxation of Mu@C₆₀ in a longitudinal applied field of 1.0 T. The fits shown are to a common amplitude exponential relaxation.

The relaxation of Mu@C₆₀ in high LF ($B \geq 0.75T$) is found to be single exponential, e.g. Fig. 4.21. The relaxation rates exhibit essentially temperature independent (T₁T)^-1 behaviour between about 50K and T_c for each of the systems, Rb₃, K₃, and Na₂Cs. In Rb₃C₆₀ we find no sample dependence, but in Na₂CsC₆₀ we find a significant difference between two runs on the same sample which we infer to be a quench-rate dependence. We thus postpone discussion of the temperature dependence in Na₂CsC₆₀ to section VII.B.