Abstract
We present a nuclear magnetic resonance study of a single crystal of (BPCB) consisting of weakly coupled spin- Heisenberg antiferromagnetic ladders. Treating ladders in the gapless phase as Luttinger liquids, we are able to fully account for (i) the magnetic field dependence of the nuclear spin-lattice relaxation rate at 250 mK and for (ii) the phase transition to a 3D ordered phase occurring below 110 mK due to weak interladder exchange coupling. BPCB is thus an excellent model system where the possibility to control Luttinger liquid parameters in a continuous manner is demonstrated and the Luttinger liquid model tested in detail over the whole fermion band.
- Received 10 June 2008
DOI:https://doi.org/10.1103/PhysRevLett.101.137207
©2008 American Physical Society