Quantum effects in a weakly-frustrated S=1/2 two-dimensional Heisenberg antiferromagnet in an applied magnetic field

2009/03/15 by N. Tsyrulin, T. Pardini, R. R. P. Singh +7 · 1 citation
Physics and Astronomy · #cond-mat.str-el

paper · pdf · doi:10.1103/physrevlett.102.197201

published as Phys. Rev. Lett. 102, 197201 (2009) · 4 pages, 5 figures

arxiv created 2009/03/15 · arxiv updated 2010/07/15

Abstract

We have studied the two-dimensional S=1/2 square-lattice antiferromagnet Cu(pz)₂(ClO₄)₂ using inelastic neutron scattering and series expansion calculations. We show that the presence of antiferromagnetic next-nearest neighbor interactions enhances quantum fluctuations associated with resonating valence bonds. Intermediate magnetic fields lead to a selective tuning of resonating valence bonds and a spectacular inversion of the zone-boundary dispersion, providing novel insight into 2D antiferromagnetism in the quantum limit.

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