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Gordon Godfrey Theoretical Seminar 2005 Triangular-Lattice Quantum AntiferromagnetsProf.
Rajiv Singh Date Abstract:
Triangular-lattice antiferromagnets represent prototypical frustrated magnetic systems. The concept of Resonating Valence Bond ground state, a novel spin-liquid phase of matter, was first introduced for these systems several decades ago. Recent numerical studies suggest that the triangular-lattice Heisenberg Model has non-colinear long-range magnetic order, but it is much more fragile compared to the unfrustrated square-lattice case. We discuss recent calculations of magnetic susceptibilities and excitation spectra in spatially anisotropic triangular-lattice antiferromagnets, which show the enhanced role of quantum fluctuations in these systems. Comparisons with various magnetic materials leaves open the possibility that these systems may turn into novel spin-liquid phases with small perturbations. Further InformationContact
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