Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2004-10-15
J.Phys.: Condens. Matter 17 (2005) 341-350
Physics
Condensed Matter
Strongly Correlated Electrons
13 pages, 6 figures
Scientific paper
10.1088/0953-8984/17/2/009
We investigate the phase diagram of the Heisenberg antiferromagnet on the square lattice with two different nearest-neighbor bonds $J$ and $J'$ ($J$-$J'$ model) at zero temperature. The model exhibits a quantum phase transition at a critical value $J'_c > J$ between a semi-classically ordered N\'eel and a magnetically disordered quantum paramagnetic phase of valence-bond type, which is driven by local singlet formation on $J'$ bonds. We study the influence of spin quantum number $s$ on this phase transition by means of a variational mean-field approach, the coupled cluster method, and the Lanczos exact-diagonalization technique. We present evidence that the critical value $J'_c$ increases with growing $s$ according to $J'_c \propto s(s+1)$.
Darradi Rachid
Farnell Damian J. J.
Richter Jadwiga
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