| Issue |
Europhys. Lett.
Volume 34, Number 2, April II 1996
|
|
|---|---|---|
| Page(s) | 145 - 150 | |
| Section | Condensed matter: electronic structure, electrical, magnetic and optical properties | |
| DOI | https://doi.org/10.1209/epl/i1996-00430-0 | |
| Published online | 01 September 2002 | |
First-order transition between magnetic order and valence bond order in a 2D frustrated Heisenberg model
Laboratoire de
Physique Quantique, Université Paul Sabatier - 31062 Toulouse, France
Received:
3
July
1995
Accepted:
28
February
1996
We study the competition between magnetic order and valence bond order in a two-dimensional (2D) frustrated Heisenberg model introduced some time ago by Shastry and Sutherland (Physica B, 108 (1981) 1069) for which a configuration of dimers is known to be the ground state in a certain range of parameters. Using exact diagonalization of small clusters, linear spin wave theory and Schwinger boson mean-field theory, we argue that the transition between the two types of order is first order, and that it takes place inside the domain where magnetic long-range order is stable with respect to quantum fluctuations.
PACS: 75.10.Jm – Quantized spin models / 75.30.Ds – Spin waves / 75.30.Kz – Magnetic phase boundaries (including magnetic transitions, metamag ne tism, etc.)
© EDP Sciences, 1996
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