| Issue |
Europhys. Lett.
Volume 54, Number 6, June II 2001
|
|
|---|---|---|
| Page(s) | 779 - 785 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2001-00322-3 | |
| Published online | 01 December 2003 | |
On the origin of heavy quasiparticles in 
1
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
Received:
12
February
2001
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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