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Hybridization-driven gap in U$$_3$$Bi$$_4$$Ni$$_3$$; A $$^{209}$$Bi NMR/NQR study

Baek, S.-H.*; Curro, N. J.*; Klimczuk, T.*; Sakai, Hironori   ; Bauer, E. D.*; Ronning, F.*; Thompson, J. D.*

We report $$^{209}$$Bi nuclear-magnetic-resonance and nuclear-quadrupole-resonance measurements on a single crystal of the Kondo insulator U$$_3$$Bi$$_4$$Ni$$_3$$. The $$^{209}$$Bi nuclear-spin-lattice relaxation rate ($$T_1^1$$) shows activated behavior and is well fit by a spin gap of 220 K. The $$^{209}$$Bi 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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Category:Materials Science, Multidisciplinary

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