Europhys. Lett.
Volume 65, Number 3, February 2004
Page(s) 358 - 364
Section Condensed matter: structure, mechanical and thermal properties
Published online 01 January 2004
Europhys. Lett., 65 (3) , pp. 358-364 (2004)
DOI: 10.1209/epl/i2003-10093-3

Lifshitz-point instabilities and re-entrant incommensurability in $\chem{Li}$ x $\chem{V_2O_5}$

H. Katzke1, M. Czank1 and P. Tolédano1, 2

1  Institute of Geosciences, Crystallography, University of Kiel Olshausenstraße 40, 24098 Kiel, Germany
2  Group "Structure of Materials under Extreme Conditions" SNBL/ESRF 38043 Grenoble Cedex, France

(Received 31 March 2003; accepted in final form 21 November 2003)

The concentration-induced sequence of three incommensurate phases ( $\epsilon$, $\epsilon_1'$, $\epsilon_2'$) previously disclosed in $\chem{Li}$ x $\chem{V_2O_5}$ are interpreted as resulting from distinct Lifshitz-invariant and Lifshitz-points instabilities. When varying the temperature, the $\epsilon$ phase displays a re-entrant behavior, which is described as a folding of the high-temperature region triggered by the ordering of the lithium ions.

64.60.-i - General studies of phase transitions.

© EDP Sciences 2004