| Issue |
Europhys. Lett.
Volume 69, Number 3, February 2005
|
|
|---|---|---|
| Page(s) | 447 - 453 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2004-10361-8 | |
| Published online | 24 December 2004 | |
The spin-SAF transition in 
induced
by spin-pseudospin coupling
1
Fakultät 7, Theoretische Physik, University of the Saarland 66041 Saarbrücken, Germany
2
Department of Physics and Astronomy, Laurentian University 935 Ramsey Lake Road, Sudbury, Ontario P3E 2C6, Canada
Received:
2
September
2004
Accepted:
23
November
2004
We present microscopic estimates for the spin-spin and
spin-pseudospin interactions of the quarter-filled ladder compound
, 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 and deduce the
absence of a soft antiferroelectric mode.
PACS: 75.10.Jm – Quantized spin models / 75.40.Mg – Numerical simulation studies
© EDP Sciences, 2005
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