Neutron scattering evidence for isolated spin-1/2 ladders in (C${}_5$D${}_{12}$N)${}_2$CuBr${}_4$

Abstract

Inelastic neutron scattering was used to determine the spin Hamiltonian for the singlet ground state system of fully deuterated BPCB, (C${}_5$D${}_{12}$N)${}_2$CuBr${}_4$. A 2-leg spin-1/2 ladder model, with $J_{\perp }=(1.09\pm 0.01)$ meV and $J_{\Vert }=(0.296\pm 0.005)$ meV, accurately describes the data. The experimental limit on the effective inter-ladder exchange constant is $|J_{\mathrm{int}}^{\mathrm{eff}}|\lesssim 0.006$ meV, and the limit on total diagonal, intra-ladder exchange is $|J_F+J_{F^{\prime }}|\le 0.1$ meV. Including the effects of copper to bromide covalent spin transfer on the magnetic form-factor, the experimental ratios of intra-ladder bond energies are consistent with the predictions of continuous unitary transformation.

10 pages, with 11 figures

References in corpus (9)

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• Thermodynamics of the Spin Luttinger-Liquid in a Model Ladder Material
• Heat conduction in low-dimensional quantum magnets
• One- and Two-Triplon Spectra of a Cuprate Ladder
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• Quantum spin correlations in an organometallic alternating sign chain
• Spin-spin correlations of the spin-ladder compound (C${}_5$H${}_{12}$N)${}_2$CuBr${}_4$ measured by magnetostriction and comparison to Quantum Monte Carlo results

Cited by in corpus (5)

• Anisotropy of Magnetic Interactions in the Spin-Ladder Compound (C${}_5$H${}_{12}$N)${}_2$CuBr${}_4$
• Theoretical study of the spin and charge dynamics of two-leg ladders as probed by resonant inelastic x-ray scattering
• Magnetic ordering induced by interladder coupling in the spin-1/2 Heisenberg two-leg ladder antiferromagnet C${}_9$H${}_{18}$N${}_2$CuBr${}_4$
• Magnetic field induced bound states in spin-$\frac{1}{2}$ ladders
• Magnetic order, disorder, and excitations under pressure in the Mott insulator Sr${}_2$IrO${}_4$