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

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

2009-02-09

arxiv.org/abs/0902.1468v2

Phy. Rev. B 79, 195120 (2009)

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1103/PhysRevB.79.195120

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.

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