Temperature dependence of the magnetic excitations in the quasi-perfect S = 1/2 kagome antiferromagnet vesignieite, BaCu3V2O8(OD)2
Quantum spin liquids (QSL) are novel states of matter that display exotic ground states and fractionalized excitations. In two dimensions, the most promising model system is the S = 1/2 kagome Heisenberg antiferromagnet (KHA), where quantum spins form a geometrically frustrated network of corner-sharing triangles. The mineral vesignieite, BaCu3V2O8(OD)2, which consists of a 0.07% distorted kagome lattice, develops a partially frozen spin state at low temperatures. This static spin structure sets vesignieite apart from other S=1/2 KHAs such as herbertsmithite, whose spins remain dynamic, and is thought to be a consequence of a significant Dzyaloshinskii- Moriya interaction. Our very recent measurements on the thermal time-of-flight spectrometer MERLIN revealed that the energy scale is much lower than anticipated, and we therefore propose to use cold neutrons on IN5 to investigate the dispersion of the 4-meV excitation observed on MERLIN and to search for magnetic scattering at lower energies salient to the QSL ground state.
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FAK Bjorn; BOLDRIN David; CANEVET Emmanuel; OLLIVIER Jacques and WILLS Andrew S.. (2014). Temperature dependence of the magnetic excitations in the quasi-perfect S = 1/2 kagome antiferromagnet vesignieite, BaCu3V2O8(OD)2. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-01-1397
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