Charge ordering and spin- Peierls transition in alpha'-NaV2O5

Details Charge ordering and spin- Peierls transition in alpha'-NaV2O5 Charge ordering and spin- Peierls transition in alpha'-NaV2O5

1998-05-19

arxiv.org/abs/cond-mat/9805230v2

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 2 figures, accepted for publication in Europhysics Letters

Scientific paper

10.1209/epl/i1998-00463-3

Recent X-ray analysis and NMR- experiments have shown that alpha'- NaV2O5 is not a conventional spin-Peierls (SP) compound because above the transition at 33K it is in a homogeneous mixed valent (MV) state and atomic spin chains do not exist. Furthermore, thermal expansion experiments have identified the existence of a double phase transition. We present a theoretical model which qualitatively explains these observations. We derive an effective Hamiltonian for the insulating state which describes the transitions as primary charge order leading to linear spin chains in b- direction and a secondary SP- transition. We show that this scenario explains in a natural way the anomalous BCS-ratio observed in alpha'- NaV2O5.

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