Publication Type
Journal
Journal Name
Physical Review B
Publication Date
Page Number
094411
Volume
80
Issue
9
Abstract
Inelastic neutron scattering was used to determine the spin Hamiltonian for the singlet ground
state system (C5D12N)2CuBr4 (BPCB). A 2-leg spin 1/2 ladder model, with J? = 1:084 � 0:005
meV and Jk = 0:321 � 0:008 meV, accurately describes the data. The experimental limit on the
inter-ladder exchange constant is jJ0j � 0.005 meV, and the limit on diagonal, intra-ladder exchange
is jJF j � 0.1 meV. The experimental ratios of intra-ladder bond energies are consistent with the
predictions of continuous unitary transformations calculations.
