Hybridization-driven gap in U3Bi4Ni3: a 209Bi NMR/NQR study

Abstract

We report 209Bi NMR and NQR measurements on a single crystal of the Kondo insulator U3Bi4Ni3. The 209Bi nuclear spin-lattice relaxation rate ($T_1^{-1}$) shows activated behavior and is well-fit by a spin gap of 220 K. The 209Bi Knight shift (K) exhibits a strong temperature dependence arising from 5f electrons, in which K is negative at high temperatures and increases as the temperature is lowered. Below 50 K, K shows a broad maximum and decreases slightly upon further cooling. Our data provide insight into the evolution of the hyperfine fields in a fully gapped Kondo insulator based on 5f electron hybridization.

arXiv comment4 pages, 4 figures, submitted to Phys. Rev. B

References in corpus (2)

• Scaling in the Emergent Behavior of Heavy Electron Materials
• Physical properties of the new Uranium ternary compounds U3Bi4M3 (M=Ni, Rh)

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