MAXIMUM-ENTROPY TF-MU-SR STUDY OF VORTEX STATES IN 1 2/3 CUPRATES/

A maximum-entropy (ME) method has been applied to TFmuSR vortex data o f RBa2Cu3O7 (R1237; R = Er, Gd and Eu). The obtained information on th e field distribution is of much better quality than that resulting fro m Fourier transformation and curve-fitting of the same data. ME applic ation to R1237 TFmuSR data taken below T(c) at LAMPF show asymmetrical , nearly triangular, field distributions, which broaden with decreasin g temperature. Significant deviations from Abrikosov predictions have been observed for the estimated R1237-vortex field distributions. Belo w 10 K, for Er1237 and Gd1237, the non-Abrikosov features appear to be influenced by the rare-earth magnetism. The low-field tail in the fie ld distribution and the ME-intensity anomaly near T(c) suggest glassy features in the 1/2/3 cuprate vortex states.