Magnetic bound states in the quarter-filled ladder system $α'-NaV_{2}O_{5}$}

Details Magnetic bound states in the quarter-filled ladder system $α'-NaV_{2}O_{5}$} Magnetic bound states in the quarter-filled ladder system $α'-NaV_{2}O_{5}$}

1998-10-06

arxiv.org/abs/cond-mat/9810062v1

Physics

Condensed Matter

Strongly Correlated Electrons

5 pages, 4 figures, to be published in PRB, brief reports, Dec. 1998

Scientific paper

10.1103/PhysRevB.58.14159

Raman scattering in the quarter-filled spin ladder system alpha'-NaV_2O_5 shows in the dimerized singlet ground state ($T \leq T_{SP}=35K$) an unexpected sequence of three magnetic bound states. Our results suggest that the recently proposed mapping onto an effective spin chain for $T > T_{SP}$ has to be given up in favor of the full topology and exchange paths of a ladder in the dimerized phase for $T < T_{SP}$. As the new ground state we propose a dynamic superposition of energetically nearly degenerate dimer configurations on the ladder.

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