Theoretical Model for the Semimetal Yb_4As_3

Details Theoretical Model for the Semimetal Yb_4As_3 Theoretical Model for the Semimetal Yb_4As_3

1995-04-20

arxiv.org/abs/cond-mat/9504078v1

Physics

Condensed Matter

7 pages, REVTeX, 1 Postscript-figure separately

Scientific paper

10.1209/0295-5075/31/5-6/013

We present a model which can explain semiquantitatively a number of the unusual properties of \mbox{Yb$_4$As$_3$}. The structural phase transition at $T_{\text{c}}\simeq300\,\mbox{K}$ is described by a band Jahn-Teller effect of correlated electrons and is interpreted as a charge ordering of the Yb ions. The low carrier concentration in the low-temperature phase follows from the strong electron correlations of the 4f-holes on the Yb sites and can be viewed as self-doping of charge-ordered chains. The observed heavy-fermion behaviour is on a scale of $T^\ast\simeq50\,\mbox{K}$ and is due to spinon-like excitations in the Yb$^{3+}$-chains. The appearance of a second low-energy scale around 0.2\,K is due to the Fermi energy of the low-density carriers.

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