Ground-state phases in a system of two competing square-lattice Heisenberg antiferromagnets

@inproceedings{DSchmalfuss2003GroundstatePI,
  title={Ground-state phases in a system of two competing square-lattice Heisenberg antiferromagnets},
  author={D.Schmalfuss and R.Herms and J.Richter and J.Schulenburg},
  year={2003}
}
We study a two-dimensional (2D) spin-half Heisenberg model related to the quasi 2D antiferromagnets ( Ba, Sr ) 2 Cu 3 O 4 Cl 2 by means of exact diagonalization and spin-wave theory. The model consists of two inequivalent interpenetrating square-lattice Heisenberg antiferromagnets A and B . While the antiferromagnetic interaction J AA within the A subsystem is strong the coupling J BB within the B subsystem is much weaker. The coupling J AB between A and B subsystems is competing giving rise… 

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