G. Chaboussant, S. T. Ochsenbein, A. Sieber, H.-U. Güdel, H. Mutka, A. Müller and B. Barbara
Mechanism of ground-state selection in the frustrated molecular spin cluster V₁₅
Europhys. Lett. 66, 423-429 (2004)                 

Abstract: We report an inelastic neutron scattering (INS) study under a magnetic field on the frustrated molecular spin cluster V₁₅. Several field-dependent transitions are observed and provide a comprehensive understanding of the low-energy quantum spin states. The energy gap 2D₀ 27(3) meV between the two lowest S=1/2 Kramers doublets is unambiguously attributed to a symmetry lowering of the cluster. The INS data are mapped onto an S=1/2 Antiferromagnetic Heisenberg triangle with scalene distortion. A quantitative description of the wave function mixing within the ground state is derived.