Issue |
Europhys. Lett.
Volume 56, Number 4, November 2001
|
|
---|---|---|
Page(s) | 596 - 602 | |
Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
DOI | https://doi.org/10.1209/epl/i2001-00562-1 | |
Published online | 01 December 2003 |
New SDW phases in quasi-one-dimensional systems dimerized in the transverse direction
1
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
Received:
31
May
2001
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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