Inelastic neutron scattering study of a nearly isolated s=1/2 triangular system KBa3Ca4Cu3V7O28
KBa3Ca4Cu3V7O28 provides a nice example of quasi-isolated spin 1/2 equilateral triangles, showing magnetic short-range ordering at very low temperature. From a NMR study, the intradimer exchange interaction would yield two quadruplet states separated by about 15-30 meV, while the lowest quadruplet would be splitted in two doublets due to a Dzyaloshinskii-Moriya (DM) interaction of about 0.1 meV. As a result, the magnetic short-range ordering would correspond to a chiral spin configuration below the corresponding temperature of about 1.1 K. We have already studied the low energy excitations around 0.1 meV on IN5 and IN6-SHARP to look for the DM interaction. The present proposal now consists in measuring the magnetic excitations spectrum around 15-30 meV, in order to determine the intra-dimer coupling constant. For this purpose, we ask for 4 days of beamtime on PANTHER using a standard orange cryostat.
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GRENIER Beatrice; FAK Bjorn; GOMILSEK Matjaz; MANGIN-THRO Lucile; PETIT Sylvain; PREGELJ Matej; ROLS Stephane and SIMONET Virginie. (2021). Inelastic neutron scattering study of a nearly isolated s=1/2 triangular system KBa3Ca4Cu3V7O28. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-05-816
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