Europhys. Lett.
Volume 70, Number 2, April 2005
Page(s) 237 - 243
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 18 March 2005
Europhys. Lett., 70 (2), pp. 237-243 (2005)
DOI: 10.1209/epl/i2004-10484-x

Quantum helimagnetism of the frustrated spin- $\frac{1}{2}$ chain $\chem{LiCuVO_4}$

M. Enderle1, C. Mukherjee2, B. Fåk3, R. K. Kremer4, J.-M. Broto5, H. Rosner6, S.-L. Drechsler7, J. Richter8, J. Malek7, 9, A. Prokofiev10, W. Assmus10, S. Pujol1, J.-L. Raggazzoni1, H. Rakoto5, M. Rheinstädter1 and H. M. Rønnow11

1  Institut Laue-Langevin - BP 156, 38042 Grenoble Cédex 9, France
2  Clarendon Laboratory - Parks Road, Oxford, OX1 3PU, UK
3  DRFMC/SPSMS, CEA - 38054 Grenoble, France
4  Max-Planck Institute for Solid State Research - 70569 Stuttgart, Germany
5  Laboratoire National des Champs Magnétiques Pulsés - 31432 Toulouse, France
6  Max-Planck Institute for Chemical Physics of Solids - 01187 Dresden, Germany
7  Institut für Festkörpertheorie im IFW Dresden - Dresden, Germany
8  Theoretische Physik, Universität Magdeburg - Magdeburg, Germany
9  Institute of Physics, ASCR - Prague, Czech Republic
10  Johann Wolfgang von Goethe Universität - Postfach 111932, 60054 Frankfurt, Germany
11  Paul-Scherrer-Institut - 5232 Villigen PSI, Switzerland

received 14 December 2004; accepted in final form 25 February 2005
published online 18 March 2005

Inelastic neutron scattering, susceptibility, and high-field magnetization identify $\chem{LiCuVO_4}$ as a nearest-neighbour ferromagnetic, next-nearest-neighbour frustrated, quasi-one-dimensional helimagnet, which is largely influenced by quantum fluctuations. Complementary band structure calculations provide a microscopic model with the correct sign and magnitude of the major exchange integrals.

75.10.Jm - Quantized spin models.
75.30.-m - Intrinsic properties of magnetically ordered materials.
71.20.-b - Electron density of states and band structure of crystalline solids.

© EDP Sciences 2005