Hyperfine magnetic field at cadmium impurity in Heusler alloys Ni2MnGa, Ni2MnIn, Cu2MnIn, and Au2MnIn

摘要

The Time Differential Perturbed Angular Correlation (TDPAC) technique has been used to measuare the hyperfine magnetic field at cadmium impurity located at the Ga site in Ni2MnGa (Tc = 379 K) and at the In site in Ni2MnIn (Tc = 323 K), Cu2MnIn (Tc = 500 K), and Au2MnIn (Tc = 140 K). Measurements utilized the 84‐nsec, 247‐keV state in Cd‐111. The temperature dependence of the hyperfine field, up to approximately .9Tc, was measured for Ni2MnGa, Ni2MnIn, and Cu2MnIn; in each case it approximately follows te Brillouin curve for J = 5/2. The sign of the hyperfine field at Cd has been measured to be negative at room temperature in Ni2MnGa, Ni2MnIn, and Cu2MnIn.