Ultrasonic investigation of the Kondo semimetal CeBi

Abstract

We report the elastic properties of the Kondo semimetal CeBi by resonant ultrasound spectroscopy measurements at zero magnetic field. Clear elastic softening is found in bulk modulus $C_B$ below $\sim 60$ K. Such a softening in $C_B$, in addition to the anomalous temperature dependent Poisson's ratio, is hardly attributable to multipolar response for stable localized $4f$ orbital, but can be well described by a two-band model arising from the hybridization between conduction- and $4f$- electrons. These results probably are consequences of the valence fluctuations in this Kondo semimetal as originally suggested by a Fermi-surface expansion observed in a previous angle-resolved photoemission spectroscopy study [P. Li \textit{et al.}, Phys. Rev. B $100$, 155110 (2019)].

7+4 pages, 5+2 figures, 2+1 tables

References in corpus (8)

• Anomalous Eu Valence State and Superconductivity in Undoped Eu3Bi2S4F4
• Self doping effect and successive magnetic transitions in superconducting Sr${}_2$VFeAsO${}_3$
• Skyrmion lattice creep at ultra-low current densities
• Unusual change in the Dirac-cone energy band upon two-step magnetic transition in CeBi
• Critical Slowing Down of Quadrupole and Hexadecapole Orderings in Iron Pnictide Superconductor
• Strong Increase in Ultrasound Attenuation Below T${}_{\mathrm{c}}$ in Sr${}_2$RuO${}_4$: Possible Evidence for Domains
• Elastic properties of a Sc-Zr-Nb-Ta-Rh-Pd high-entropy alloy superconductor
• Field-induced valence fluctuation in YbB${}_{12}$

Cited by in corpus (1)

• ${}^{27}$Al NMR study of the magnetic Weyl semimetal CeAlGe