Abstract
Elastic constants of the mixed valence compound Yb 4As 3 with extremely low carrier 0.001 per Yb atom have been measured by the ultrasonic method. We found that the transverse C 44 mode exhibits a pronounced softening around the structural phase transition point at T c = 292 K due to the charge ordering of Yb 3+ ions along <111 direction. We interpret the softening of C 44 with the coupling of the strain ε yz , ε zx and ε xy to charge fluctuation mode processing the electric quadrupole moment in Yb 3+ linear chain.
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