Magnetic excitations in the S=1/2 kagome antiferromagnet and quantum spin liquid candidate `Mg-herbertsmithite', MgCu3(OD)6Cl2
We propose to study the magnetic excitations in the quantum spin liquid (QSL) candidate 'Mg-herbertsmithite', which forms a geometrically perfect and highly frustrated 2D kagome lattice of S=1/2 quantum spins with dominant antiferromagnetic nearest-neighbor interactions. No long-range order is observed down to T=20 mK and recent theoretical work predicts a rich phase diagram with different types of gapless, chiral and U(1) quantum spin liquids that await experimental confirmation. The measurements aim at determining the nature of the excitations, which could be bosonic quasiparticles forming a discrete excitation spectrum or fractionalized fermionic quasiparticles forming a continuum, which could be gapped or not.
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WILLS Andrew S.; BOLDRIN David; FAK Bjorn and OLLIVIER Jacques. (2015). Magnetic excitations in the S=1/2 kagome antiferromagnet and quantum spin liquid candidate `Mg-herbertsmithite', MgCu3(OD)6Cl2. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-05-629
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