Mechanism of Ground State Selection in the Frustrated Molecular Spin Cluster V15

Details Mechanism of Ground State Selection in the Frustrated Molecular Spin Cluster V15 Mechanism of Ground State Selection in the Frustrated Molecular Spin Cluster V15

2004-01-29

arxiv.org/abs/cond-mat/0401614v1

Europhysics Letters, vol 66, pp 423-429 (2004)

Physics

Condensed Matter

Strongly Correlated Electrons

To be published in Europhysics Letters 7 pages, 3 figures

Scientific paper

10.1209/epl/i2004-10008-x

We report an inelastic neutron scattering (INS) study under a magnetic field on the frustrated molecular spin cluster $V_{15}$. Several field-dependent transitions are observed and provide a comprehensive understanding of the low-energy quantum spin states. The energy gap $2 \Delta_{0}\approx 27(3)\mu$eV 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 wavefunction mixing within the ground state is derived.

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