Volume 83, Number 4, August 2008
|Number of page(s)||6|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||30 July 2008|
The quantum J1-J'1-J2 spin-1 Heisenberg model: Influence of the interchain coupling on the ground-state magnetic ordering in 2D
School of Physics & Astronomy, Schuster Building, The University of Manchester - Manchester, M13 9PL, UK, EU
2 School of Physics & Astronomy, University of Minnesota - 116 Church St. SE, Minneapolis, MN 55455, USA
3 Institut für Theoretische Physik, Universität Magdeburg - 39016 Magdeburg, Germany, EU
Accepted: 25 June 2008
We study the phase diagram of the isotropic J1- -J2 Heisenberg model for spin-1 particles on an anisotropic square lattice, using the coupled-cluster method. We find no evidence for an intermediate phase between the Néel and stripe states, as compared with all previous results for the corresponding spin-1/2 case. However, we find a quantum tricritical point at ≈ 0.66± 0.03, ≈ 0.35± 0.02, where a line of second-order phase transitions between the quasi-classical Néel and stripe-ordered phases (for ≲ 0.66) meets a line of first-order phase transitions between the same two states (for≳ 0.66).
PACS: 75.10.Jm – Quantized spin models / 75.30.Gw – Magnetic anisotropy / 75.50.Ee – Antiferromagnetics
© EPLA, 2008
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