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, arranged on a triangular lattice and forming a breathing-kagome network. According to a recent NMR study, the intradimer exchange interaction yields two quadruplet states separated by about 20-30 meV. Effective degrees of freedom, formed by the lowest energy quadruplet, are thus a collection of two effective spin ½ coming in two flavors and corresponding to left and right chiralities. Preliminary measurements indicate the rise of another low energy scale, of about 1 K, with signatures in NMR, specific heat and magnetic correlations (measured at IN5 and IN6-SHARP). A large signal is observed at about 0.1 meV. The present proposal now consists in measuring those magnetic excitations with the best energy resolution available only at IN5, and at the lowest temperature to fully describe this spectrum and especially check the opening of a spin gap.
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PETIT Sylvain; GRENIER Beatrice; MANGIN-THRO Lucile; OLLIVIER Jacques; SIMONET Virginie and ZORKO Andrej. (2021). Inelastic neutron scattering study of a nearly isolated s=1/2 triangular system KBa3Ca4Cu3V7O28. Institut Laue-Langevin (ILL) doi:10.5291/ILL-DATA.4-05-834
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