Abstract
Recent NMR experiments on [Bobroff et al. Phys. Rev. Lett. 79, 2117 (1997)] have shown that Ni impurities provide an important probe for the momentum dependence of the static spin susceptibility Combining the measurements of the line width with those of the Gaussian relaxation time we find that the magnetic correlation length must have a substantial temperature dependence. Using numerical simulations we present a detailed analysis of as a function of temperature and impurity concentration. For a Lorentzian shape of strongly depends on in contrast to the Gaussian form. This result together with the experimental finding that is temperature dependent rules out the Gaussian form of
- Received 26 January 1998
DOI:https://doi.org/10.1103/PhysRevB.58.11193
©1998 American Physical Society