Extended Data Fig. 4: 89Y NMR evidence of spin freezing for p = 0.064 (YBa2Cu3O6.38).
From: Signatures of two gaps in the spin susceptibility of a cuprate superconductor
A broad peak in the spin-lattice relaxation rate 1/T1 vs. T is the typical signature of spin fluctuations becoming as slow as the NMR frequency scale of 31 MHz (here in a field of 15 T). Error bars correspond to one standard deviation in fits of the time-dependence of the NMR signal to the theoretical law for relaxation by magnetic fluctuations. The line is a guide to the eye.
