Volume 56, Number 4, November 2001
|Page(s)||596 - 602|
|Section||Condensed matter: electronic structure, electrical, magnetic and optical properties|
|Published online||01 December 2003|
New SDW phases in quasi-one-dimensional systems dimerized in the transverse direction
Laboratoire de Physique Théorique et Hautes Energies
Universités Paris VI Pierre et Marie Curie - Paris VII Denis Diderot
2 Place Jussieu, 75252 Paris Cédex 05, France
2 Department of Physics, Faculty of Science, University of Zagreb P.O. Box 331, 10002 Zagreb, Croatia
Accepted: 3 September 2001
The spin density wave instabilities in the quasi-one-dimensional metal (TMTSF)2ClO4 are studied in the framework of a matrix random phase approximation for intraband and interband order parameters. Depending on the anion ordering potential V which measures the lattice doubling in the transverse direction, two different instabilities are possible. The SDW0 state at low values of V is antiferromagnetic in the b direction and has a critical temperature that decreases rapidly with V. The degenerated states SDW, stable at higher values of V, are superpositions of two magnetic orders, each one on its sub-family of chains. As V increases, the ratio between the two components of SDW tends to zero and the critical temperature increases asymptotically towards that of SDW instability for a system having perfect nesting and no anion order. At intermediate V, i.e. between the phases SDW0 and SDW, the metallic state can persist down to T=0.
PACS: 75.30.Fv – Spin-density waves / 75.10.Lp – Band and itinerant models / 74.70.Kn – Organic superconductors
© EDP Sciences, 2001
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