Model for the Semimetal Yb 4 As 3
نویسنده
چکیده
We present a model which can explain semiquantitatively a number of the unusual properties of Yb4As3. The structural phase transition at Tc ≃ 300K 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 ∗ ≃ 50K and is due to spinon-like excitations in the Yb3+-chains. The appearance of a second low-energy scale around 0.2K is due to the Fermi energy of the low-density carriers. Typeset using REVTEX
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تاریخ انتشار 1995