The Co⁵⁹ Nuclear Magnetic Resonances in (Y_1−xGd_x)₂Co₁₇

Abstract

The nuclear magnetic resonances of Co⁵⁹ in (Y_1−xGd_x)₂Co₁₇ have been observed at 77 K as a function of x (0≤x≤1). The difference in resonance frequencies between Y₂Co₁₇ and Gd₂Co₁₇ is at most 7 kOe in magnitude, which is comparable to that obtained in GdCo₅. The sign of the obtained difference depends on the Co sites. The difference is qualitatively explained as the contribution of 4f electrons of Gd atoms to the hyperfine field. The temperature dependence of the resonance frequencies in Gd₂Co₁₇ has also been measured.