Europhys. Lett., 63 (5) , pp. 757-763 (2003)
: A new narrow-band spin-gap materialT. 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 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 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.
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