NMR Study of ²⁷Al in (Gd_1−xTb_x)Al₂

Abstract

Nuclear magnetic resonance of ²⁷Al nuclei in (Gd_1−xTb_x)Al₂ has been observed at 4.2 K as a function of Tb concentration. Two peaks are observed and their positions decrease almost linearly with Tb concentration, indicating that the gadolinium moment direction does not change all over the concentration. The transferred hyperfine fields from rare earth ions in these compounds are analysed from RKKY theory.