Field-induced Tomonaga-Luttinger liquid phase of a two-leg spin-1/2 ladder with strong leg interactions
Abstract
We study the magnetic-field-induced quantum phase transition from a gapped quantum phase that has no magnetic long-range order into a gapless phase in the spin-1/2 ladder compound bis(2,3-dimethylpyridinium) tetrabromocuprate (DIMPY). At temperatures below about 1~K, the specific heat in the gapless phase attains an asymptotic linear temperature dependence, characteristic of a Tomonaga-Luttinger liquid. Inelastic neutron scattering and the specific heat measurements in both phases are in good agreement with theoretical calculations, demonstrating that DIMPY is the first model material for an S = 1 / 2 two-leg spin ladder in the strong-leg regime.
The work at ORNL was partially funded by the Division of Scientific User Facilities, Office of BES, DOE.- Publication:
-
APS March Meeting Abstracts
- Pub Date:
- March 2011
- Bibcode:
- 2011APS..MART18013H