Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2001-04-27
Phys. Rev. B 64, 024433 (2001)
Physics
Condensed Matter
Strongly Correlated Electrons
6 pages, 6 Postscipt figures; Accepted for publication in Phys. Rev. B
Scientific paper
10.1103/PhysRevB.64.024433
We study a square-lattice spin-half Heisenberg model where frustration is introduced by competing nearest-neighbor bonds of different signs. We discuss the influence of quantum fluctuations on the nature of the zero-temperature phase transitions from phases with collinear magnetic order at small frustration to phases with noncollinear spiral order at large frustration. We use the coupled cluster method (CCM) for high orders of approximation (up to LSUB6) and the exact diagonalization of finite systems (up to 32 sites) to calculate ground-state properties. The role of quantum fluctuations is examined by comparing the ferromagnetic-spiral and the antiferromagnetic-spiral transition within the same model. We find clear evidence that quantum fluctuations prefer collinear order and that they may favour a first order transition instead of a second order transition in case of no quantum fluctuations.
Krüger Sven E.
Richter Johannes
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