NMR Study of Antiferromagnetic CrAl Alloys

Abstract

NMR signals of ²⁷Al in the commensurable state of CrAl alloys were observed at liquid He temperatures. The hyperfine field at Al site due to the magnetic moment of Cr atom is about 32 kOe/μ_B. The hyperfine field of ²⁷Al increases with increasing Al concentration almost in proportion to the average magnetic moment. The nuclear spin-lattice relaxation time, T₁, has been also measured under the same condition. The product of T₁ and the temperature, T₁T, increases with Al content.