Quantum effects in a weakly frustrated s=1/2 two-dimensional heisenberg antiferromagnet in an applied magnetic field.
- Tsyrulin N Laboratory for Solid State Physics, ETH Zurich, CH-8093 Zurich, Switzerland.
- Pardini T
- Singh RR
- Xiao F
- Link P
- Schneidewind A
- Hiess A
- Landee CP
- Turnbull MM
- Kenzelmann M
- 2009-06-13
Published in:
- Physical review letters. - 2009
English
We have studied the two-dimensional S=1/2 square-lattice antiferromagnet Cu(pz)_{2}(ClO4)_{2} (where pz denotes pyrazine), using neutron inelastic 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.
- Language
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- English
- Open access status
- green
- Identifiers
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- DOI 10.1103/PhysRevLett.102.197201
- PMID 19518991
- Persistent URL
- https://sonar.ch/global/documents/123704
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