NMR Study of159Tb in Tb1-xGdxMn2and Tb1-xLuxMn2Pseudobinary Intermetallic Compounds

Abstract

Spin echo NMR measurements on 159 Tb have been done in magnetically ordered state of the cubic Laves phase compounds Tb 1- x Gd x Mn 2 with 0≦ x ≦0.8 and Tb 1- x Lu x Mn 2 with 0≦ x ≦0.25. In the Tb 1- x Gd x Mn 2 compounds, the magnetic hyperfine field of Tb decreases from 3365 kOe for x =0.8 to 3336 kOe for x =0 and the magnitude of the electric quadrupole splitting of 159 Tb is nearly constant within experimental uncertainty. In the Tb 1- x Lu x Mn 2 compounds, the transferred hyperfine field at Tb from the neighboring rare earth ions was estimated to be +20 kOe per rare earth spin. From the hyperfine field analysis of Tb in these compounds, the orbital polarization contribution is expected to the self polarization field due to the conduction electron polarization by the parent Tb 3+ ion. An external magnetic field dependence of the spin echo intensity of 159 Tb in TbMn 2 was also investigated.