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Phys. Rev. B 80, 094411 (2009) [8 pages]

Neutron scattering evidence for isolated spin- 1/2 ladders in (C5D12N)2CuBr4

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A. T. Savici1,*, G. E. Granroth2, C. L. Broholm1,3, D. M. Pajerowski4, C. M. Brown3, D. R. Talham5, M. W. Meisel4, K. P. Schmidt6, G. S. Uhrig6,†, and S. E. Nagler2
1Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA
2Neutron Scattering Sciences Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6477, USA
3NCNR, National Institute of Standards and Technology, Gaithersburg, Maryland 20899-6100, USA
4Department of Physics and NHMFL, University of Florida, Gainesville, Florida 32611-8440, USA
5Department of Chemistry, University of Florida, Gainesville, Florida 32611-7200, USA
6Lehrstuhl für theoretische Physik I, Otto-Hahn-Str. 4, D-44221 Dortmund, Germany

Received 3 February 2009; revised 17 August 2009; published 18 September 2009

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.

© 2009 The American Physical Society

URL:
http://link.aps.org/doi/10.1103/PhysRevB.80.094411
DOI:
10.1103/PhysRevB.80.094411
PACS:
75.10.Jm, 75.40.Gb, 75.50.Ee, 78.70.Nx

*saviciat@ornl.gov

†On leave at the University of New South Wales, Sydney, Australia.

 
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