Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-01-22
Physica B 346-347, 6-10 (2004)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 5 figures. Proc. of the 7th International Symposium of Research in High Magnetic Fields in Toulouse, France (July 200
Scientific paper
10.1016/j.physb.2004.01.010
The role of various magnetic inter-chain couplings has been investigated recently by numerical methods in doped frustrated quantum spin chains. A non-magnetic dopant introduced in a gapped spin chain releases a free spin-1/2 soliton. The formation of a local magnetic moment has been analyzed in term of soliton confinement. A four-spin coupling which might originate from cyclic exchange is shown to produce such a confinement. Dopants on different chains experience an effective space-extended non-frustrating pairwise spin interaction. This effective interaction between impurity-spins is long-ranged and therefore is expected to play a crucial role in the mecanism of antiferromagnetic (AF) long-range ordering (LRO) observed in spin-Peierls (SP) compounds such as CuGeO$_3$ doped with non-magnetic impurities.
Laflorencie Nicolas
Poilblanc Didier
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