The Spin-SAF transition in NaV2O5 induced by spin-pseudospin coupling

Details The Spin-SAF transition in NaV2O5 induced by spin-pseudospin coupling The Spin-SAF transition in NaV2O5 induced by spin-pseudospin coupling

Publishing date

2004-03-10

URL

arxiv.org/abs/cond-mat/0403263v1

Journals

Europhys. Lett. Vol. 69, 447 (2005).

Science

Physics

Field

Condensed Matter

SubField

Strongly Correlated Electrons

Type

Scientific paper

Digital Object Identifier

10.1209/epl/i2004-10361-8

Abstract

We present microscopic estimates for the spin-spin and spin-speudospin interactions of the quarter-filled ladder compound NaV2O5, obtained by exactly diagonalizing appropriate clusters of the underlying generalized Hubbard Hamiltonian. We present evidence for a substantial interladder spin-pseudospin interaction term which would allow simultaneously for the superantiferroelectric (SAF) charge (pseudospin) ordering and spin dimerization. We discuss the values of the coupling constants appropriate for NaV2O5 and deduce the absence of a soft antiferroelectric mode.

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