The contribution of Gd and Mn neighbours to the Gd hyperfine field in GdMn6Ge6

With the help of Gd-155,Gd-157 NMR in GdxY1-xMn6Ge6 we derive the contribut ion of Gd and Mn neighbours to the hyperfine field at the rare earth site i n the spiral spin phase of the intermetallic compound GdMn6Ge6. The substit ution of Gd for Y atoms allows the determination of the separate contributi on of remote Gd neighbours. The different temperature dependence of the hyp er fine contributions of the Gd and Mn neighbours gives the possibility to estimate the transferred hyperfine field of Mn at the rare earth site both in magnitude and sign.