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Charge ordering and heavy fermions in the semimetal Yb4As3

✍ Scribed by Burkhard Schmidt; Peter Thalmeier; Peter Fulde

Publisher
Elsevier Science
Year
1996
Tongue
English
Weight
224 KB
Volume
223-224
Category
Article
ISSN
0921-4526

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✦ Synopsis

We present a model for Yb4As3 which can explain semiquantitatively a number of its unusual properties. Based on the view of the Yb-sites as being aligned on chains, the structural phase transition at Tc ~ 300 K is described by a band Jahn-Teller effect of correlated electrons being driven by a charge ordering of the Yb-ions. The qualitative behavior of the corresponding elastic constant c44 is explained. The heavy-fermion behavior on a scale of T* -~ 50 K is understood within the framework of a slave-boson approximation to the effective low-temperature Hamiltonian.

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## Abstract Landau quasiparticle (qp) theory may be extended into the non‐Fermi liquid regime of metallic compounds near a quantum critical point (QCP), provided the width of the quasiparticle states is less than their energy. Sufficiently far from the QCP, when the critical fluctuations are non‐in