Antiferromagnetism ofLa2CuO4−ystudied by muon-spin rotation
1987
Zero-field spin precession of positive muons has been observed in the antiferromagnetic state of ${\mathrm{La}}_{2}$${\mathrm{CuO}}_{4\mathrm{\ensuremath{-}}\mathrm{y}}$. Sharp onsets of the sublattice magnetization are found at temperatures close to those of the susceptibility maxima of different specimens. The long-lived precession signal indicates a microscopically homogeneous distribution of spin density at each Cu atom below the N\'eel temperature. Combination of the present results and neutron-scattering studies indicates the ordered moment per Cu atom to be significantly less than 1${\mathrm{\ensuremath{\mu}}}_{\mathrm{B}}$.
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