Field dependent effective masses in YbAl$_{3}$

Details Field dependent effective masses in YbAl$_{3}$ Field dependent effective masses in YbAl$_{3}$

2002-09-12

arxiv.org/abs/cond-mat/0209303v1

Physical Review Letters 90, 166404 (2003)

Physics

Condensed Matter

Strongly Correlated Electrons

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

Scientific paper

10.1103/PhysRevLett.90.166404

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 $B^{*} \sim$ 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 $B^{*}$ 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.

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