Abstract
We report a detailed study of the temperature and magnetic-field dependence of the spin susceptibility for a single crystal of . From a quantitative analysis, we find that the temperature-dependent anisotropy of the susceptibility, observed in both the paramagnetic and stripe-ordered phases, directly indicates that localized Cu moments dominate the magnetic response. A field-induced spin-flop transition provides further corroboration for the role of local moments. Contrary to previous analyses of data from polycrystalline samples, we find that a commonly assumed isotropic and temperature-independent contribution from free carriers, if present, must be quite small. Our conclusion is strengthened by extending the quantitative analysis to include crystals of with and 0.155. On the basis of our results, we present a revised interpretation of the temperature and doping dependence of the spin susceptibility in .
2 More- Received 6 November 2008
DOI:https://doi.org/10.1103/PhysRevB.78.214507
©2008 American Physical Society