MUON-SPIN-ROTATION STUDY OF VORTEX STATES IN RBA2CU3O7 USING MAXIMUM-ENTROPY ANALYSIS

A maximum-entropy method has been applied to transverse-field muon-spi n-rotation vortex data of RBa2Cu3O7 (R 1:2:3:7; R =Er, Gd, and Eu); th is produces spectra representing estimates for the magnetic-field dist ributions. The information on the field distribution is of better qual ity than that resulting from Fourier transformation and curve fitting of the same data. Significant deviations from Abrikosov predictions ha ve been observed for the estimated R 1:2:3:7 vortex-field distribution s. Below 10 K, for Er 1:2:3:7 and Gd 1:2:3:7, the non-Abrikosov featur es appear to be influenced by the magnetism of the rare-earth layers.