Nuclear Magnetic Relaxation in Weakly Antiferromagnetic Metals

Abstract

Nuclear spin-lattice relaxation rates 1/T₁ in weakly antiferromagnetic metals are studied by using the renormalized spin fluctuation theory. Above the Néel temperature T_N the theory predicts that 1/T₁ is proportional to T⁄(T−T_N)^1⁄2. Below T_N the importance of anisotropy and magnetostriction is pointed out and the result predicts that 1/T₁ is proportional to T⁄M(T), where M(T) is the staggered magnetization. Some numerical examples based on the electron gas model with Umklapp processes are shown.