Neutron scattering evidence for isolated spin-1/2 ladders in (C5D12N)2CuBr4
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Inelastic neutron scattering was used to determine the spin Hamiltonian for the singlet ground-state system of fully deuterated BPCB, (C5D12N)2CuBr4. A two-leg spin-1/2 ladder model, with J⊥=(1.09±0.01) meV and J∥=(0.296±0.005) meV, accurately describes the data. The experimental limit on the effective interladder exchange constant is |Jinteff|≤0.006 meV, and the limit on total diagonal, intraladder exchange is |JF+JF'|≤0.1 meV. Including the effects of copper to bromide covalent spin transfer on the magnetic form factor, the experimental ratios of intraladder bond energies are consistent with the predictions of continuous unitary transformation.