Scaling Behavior of the Generalized Susceptibility inLa2−xSrxCuO4+y

Abstract

We have measured the static and dynamic spin fluctuations in a crystal of ${\mathrm{La}}_{2-x}{\mathrm{Sr}}_x\mathrm{Cu}{\mathrm{O}}_{4+y}$ in the spin-glass doping regime. The static spin correlations are well described by a simple model in which the inverse correlation length $\kappa (x, T)=\kappa (x, 0)+\kappa (0, T)$. The dynamic spin fluctuations exhibit a simple scaling behavior in $\frac{\omega }{T}$ for temperatures $10 \mathrm{K}\le T\le 500 \mathrm{K}$ for the measured energies $4.5\le \omega \le 12$ meV.