Abstract
We present high-resolution measurements of the -axis thermal expansion and magnetostriction of piperidinium copper bromide . The experimental data at low temperatures are well accounted for by a two-leg spin-ladder Hamiltonian. The thermal expansion shows a complex behavior with various sign changes and approaches a divergence at the critical fields. All low-temperature features are semiquantitatively explained within a free-fermion model; full quantitative agreement is obtained with quantum Monte Carlo simulations.
- Received 9 November 2007
- Publisher error corrected 19 February 2008
DOI:https://doi.org/10.1103/PhysRevLett.100.067208
©2008 American Physical Society
Corrections
19 February 2008