| Issue |
Europhys. Lett.
Volume 35, Number 2, July II 1996
|
|
|---|---|---|
| Page(s) | 109 - 114 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1996-00540-7 | |
| Published online | 01 September 2002 | |
Excitations in spin chains and specific-heat anomalies in Yb4As3
Max-Planck-Institut für
Physik komplexer Systeme - D-01187 Dresden, Germany
Received:
29
February
1996
Accepted:
23
May
1996
An explanation is given for the observed magnetic-field dependence of
the low-temperature specific-heat coefficient of
. It is based on a recently
developed model for that material which can explain the observed
heavy-fermion behaviour. According to it, the
ions are positioned in a net of parallel chains
with an effective spin coupling of the order of 
. The magnetic-field dependence can be understood by including a
weak magnetic coupling J' between adjacent chains. The data require
a ratio 
. In that case the experimental results
can be reproduced very well by the theory.
PACS: 71.27.+a – Strongly correlated electron systems / 75.20.Hr – Local moment in compounds and alloys; Kondo effect, valence fluctuations, heavy fermions / 75.30.Ds – Spin waves
© EDP Sciences, 1996
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