NMR Study of Hyperfine Fields at ¹⁵³Eu in EuSe_1−xTe_x with x≤0.1

Abstract

The ¹⁵³Eu NMR in EuSe_1−xTe_x with x≤0.1 has been observed in the temperature range between 1.7 and 4.2 K. The results of NMR, together with those of differential magnetic susceptibilities, show that the Type II antiferromagnetic (NSNS) phase or EuSe is stabilized by substituting a small amount of Te. In the NSNS phase of EuSe_1−xTe_x the ¹⁵³Eu NMR frequency extrapolated to 0 K is independent of x and is 121.8 MHz, corresponding to a field of 262.6 kOe. The ¹⁵³Eu hyperfine field transferred from six next nearest neighbors in EuSe is estimated as −(25±2) kOe, which is comparable to a value of −24 kOe in EuTe.