NMR Study of Co⁵⁹ in Co₂TiAl below and above the Curie Temperature

Abstract

NMR measurements for Co 59 in Co 2 TiAl below and above the Curie point 135 K were carried out. The hyperfine field H hf was found to be +16.6±0.1 kOe at 4.2 K and to decrease with increasing temperature in good agreement with the saturation magnetic moment, i.e. with the magnetic moment of cobalt atom, µ Co . At temperatures above 200 K, the Knight shift K changes linearly with respect to the susceptibility χ with a slope corresponding to +49.2±2 kOe/µ B . This value is in good agreement with the ratio H hf /µ Co in the ferromagnetic region.