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

Thalmeier, P.; Fulde, Peter

doi:10.1209/epl/i1998-00463-3

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

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Thalmeier, P.
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Fulde, Peter
Max Planck Institute for the Physics of Complex Systems, Max Planck Society;

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Thalmeier, P., & Fulde, P. (1998). Charge ordering and spin-Peierls transition in alpha '-NaV2O5. EPL, 44(2), 242-248. doi:10.1209/epl/i1998-00463-3.

Cite as: https://hdl.handle.net/11858/00-001M-0000-002B-A718-7

Abstract

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 33 K 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 the 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.