The Co59 Nuclear Magnetic Resonances in (Y1-xGdx)2Co17

Abstract

The nuclear magnetic resonances of Co ⁵⁹ in (Y _{1- x} Gd _x ) ₂ Co ₁₇ have been observed at 77 K as a function of x (0≤ x ≤1). The difference in resonance frequencies between Y ₂ Co ₁₇ and Gd ₂ Co ₁₇ is at most 7 kOe in magnitude, which is comparable to that obtained in GdCo ₅ . The sign of the obtained difference depends on the Co sites. The difference is qualitatively explained as the contribution of 4 f electrons of Gd atoms to the hyperfine field. The temperature dependence of the resonance frequencies in Gd ₂ Co ₁₇ has also been measured.