/sup 59/Co NMR and Nuclear Magnetic Relaxation Study of the Magnetic Superconductor Y/sub 9/Co/sub 7/

摘要

The magnetic superconductor Y/sub 9/Co/sub 7/ presented in its structure magnetic and non-magnetic Co atoms. A search was made of the /sup 59/Co NMR lines attributed in the literature to magnetic Co atoms, With negative results. For the strong /sup 59/Co NMR line arising from nuclei of non-magnetic Co atoms the relaxation times T/sub 1/ and T/sub 2/ versus temperature were measured directly at 6.5 MHz and 9.0 MHz. A linear dependence on temperature was observed for 1/T/sub 1/ which can be attributed to interactions with conduction electrons. 1/T/sub 2/ is not linear with temperature, an effect that is related to the temperature dependence of the magnetization. (Atomindex citation 18:077617)