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Hong, Tao; Kim, Y H; Hotta, C; Takano, Y; Tremelling, G; Turnbull, M M; Landee, C P; Kang, H-J; Christensen, N B; Lefmann, K; Schmidt, K P; Uhrig, G S; Broholm, C
Physical review letters, 2010-Sep-24, Volume: 105, Issue: 13Journal Article
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.
