Field dependent effective masses in YbAl${}_3$

Abstract

We show for the intermediate valence compound YbAl${}_3$ that the high field (40 $\lesssim B\lesssim$ 60T) effective masses measured by the de Haas-van Alphen experiment for field along the $<111>$ direction are smaller by approximately a factor of two than the low field masses. The field $B^{\ast }\sim$ 40T for this reduction is much smaller than the Kondo field $B_K\sim k_B{T}_K/{\mu }_B$ ($T_K\sim$ 670K) but is comparable to the field $k_B{T}_{coh}/{\mu }_B$ where $T_{coh}\sim$ 40K is the temperature for the onset of Fermi liquid coherence. This suggests that the field scale $B^{\ast }$ does not arise from 4$f$ polarization but is connected with the removal of the anomalies that are known to occur in the Fermi liquid state of this compound.

7 pages plus 3 figures Submitted to PRL 9/12/02

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