NMR studies on heavy fermion materials CeCuAl3 and CeCuGa3

Abstract

Microscopic magnetic properties of heavy fermion antiferromagnets CeCuAl3 and CeCuGa3 of BaAl4 type have been studied by NMR measurements at 0.4∼300K. The NMR spectra for Al and Cu in thec-plane|H oriented CeCuAl3 were composed of well resolvede 2 qQ peaks, indicating good sample quality. From theK vs χ plot the transferred hyperfine fields for Al and Cu in CeCuAl3 and those for Cu and Ga in CeCuGa3 were determined to be 3.2, 4.8, 2.6 and 5.9kOe/μ B -Ce, respectively. The relaxation rate 1/T 1 vsT for Al in CeCuAl3 behaved similarly as in CeAl2, i.e. local 4f-moment type forT>T N and gap type forT<T N .