| Issue |
Europhys. Lett.
Volume 42, Number 6, June II 1998
|
|
|---|---|---|
| Page(s) | 661 - 666 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1998-00302-7 | |
| Published online | 01 September 2002 | |
Thermodynamic, transport and magnetic properties of
-NaV2O5
Institut für Physik, Universität Augsburg - D-86135 Augsburg, Germany
Received:
5
January
1998
Accepted:
21
April
1998
We report on heat capacity, electrical resistance and high-temperature ESR
experiments on the spin-Peierls compound -
. The spin
susceptibility at high temperatures (
) closely follows a Bonner-Fisher behavior with
an exchange interaction but differs significantly from this predictions at lower
temperatures. The temperature dependence of the heat capacity can be explained assuming a sum of a
linear (magnetic) and a Debye (lattice) contribution. The specific-heat jump at 
cannot be described by the opening of a gap in
mean-field approximation. The release of entropy is almost by a factor of 20
too high compared to the MF predictions of the Bonner-Fisher model for a
uniform AFM spin chain with an exchange interaction of 
. The
electrical resistance R(T) can roughly be described by variable-range
hopping processes and a large anomaly at the transition into the
low-temperature dimerized state. From these observations we conclude that
the phase transition in -
at 35 K cannot
be explained by a spin-Peierls transition alone.
PACS: 71.30.+h – Metal-insulator transitions and other electronic transitions / 72.20.-i – Conductivity phenomena in semiconductors and insulators / 76.30.-v – Electron paramagnetic resonance and relaxation
© EDP Sciences, 1998
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