Europhys. Lett.
Volume 63, Number 5, September 2003
Page(s) 757 - 763
Section Condensed matter: electronic structure, electrical, magnetic, and optical properties
Published online 01 November 2003
DOI: 10.1209/epl/i2003-00467-y
Europhys. Lett., 63 (5) , pp. 757-763 (2003)

$\chem{BiCu_2VO_6}$: A new narrow-band spin-gap material

T. Masuda1, A. Zheludev1, H. Kageyama2 and A. N. Vasiliev2, 3

1  Condensed Matter Science Division, Oak Ridge National Laboratory Oak Ridge, TN 37831-6393, USA
2  Institute for Solid State Physics, University of Tokyo 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan
3  Department of Low Temperature Physics M. V. Lomonosov Moscow State University - Moscow 119899, Russia

(Received 14 April 2003; accepted in final form 25 June 2003)

A new spin-ladder family material $\chem{BiCu_2VO_6}$ is studied by means of magnetic susceptibility, heat capacity and neutron inelastic-scattering measurements on a powder sample. Singlet ground state and finite spin-gap are confirmed by thermal-activated-type susceptibility and by a distinct peak at 16 $\un{meV}$ in spin excitation. A triple-narrow-band structure in the spin excitation spectrum, probably due to the complex crystal structure, is observed and the possibility of a weakly interacting spin-cluster system is discussed.

75.10.Pq - Spin chain models.
75.30.Ds - Spin waves.
75.30.Et - Exchange and superexchange interactions.

© EDP Sciences 2003