Volume 54, Number 6, June II 2001
|Page(s)||779 - 785|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 December 2003|
On the origin of heavy quasiparticles in
Max Planck Institut für Physik komplexer Systeme
Nöthnitzer Strasse, 38, D-01187 Dresden, Germany
2 Max Planck Institut für Chemische Physik fester Stoffe Nöthnitzer Strasse, 40, D-01187 Dresden, Germany
3 Institute for Metal Physics of the National Academy of Sciences of Ukraine 36 Vernadskii Avenue, Kiev, 01142, Ukraine
4 B. I. Verkin Institute for Low Temperature Physics and Engineering of the National Academy of Sciences of Ukraine 47 Lenin Avenue, Kharkov, 61164, Ukraine
Accepted: 6 April 2001
An explanation is provided for the heavy quasiparticle excitations in LiV2O4. It differs considerably from that of other known heavy-fermion systems. Main ingredients of our theory are the cubic spinel structure of the material and strong short-range correlations of the d electrons. The large γ coefficient is shown to result from excitations of Heisenberg spin rings and chains. The required coupling constant is calculated from LDA+U calculations and is found to be of the right size. Also the calculated Sommerfeld-Wilson ratio is reasonably close to the observed one.
PACS: 71.27.+a – Strongly correlated electron systems; heavy fermions / 71.10.-w – Theory and models of many-electron systems / 75.40.Cx – Static properties (order parameter, static susceptibility, heat capacities, critical exponents, etc.)
© EDP Sciences, 2001
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