title: 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.
authors.affiliation: Neutron Scattering Science Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA. hongt@ornl.gov
authors.forename: Tao
authors.initials: T
authors.lastname: Hong
authors.forename: Y H
authors.initials: YH
authors.lastname: Kim
authors.forename: C
authors.initials: C
authors.lastname: Hotta
authors.forename: Y
authors.initials: Y
authors.lastname: Takano
authors.forename: G
authors.initials: G
authors.lastname: Tremelling
authors.forename: M M
authors.initials: MM
authors.lastname: Turnbull
authors.forename: C P
authors.initials: CP
authors.lastname: Landee
authors.forename: H-J
authors.initials: HJ
authors.lastname: Kang
authors.forename: N B
authors.initials: NB
authors.lastname: Christensen
authors.forename: K
authors.initials: K
authors.lastname: Lefmann
authors.forename: K P
authors.initials: KP
authors.lastname: Schmidt
authors.forename: G S
authors.initials: GS
authors.lastname: Uhrig
authors.forename: C
authors.initials: C
authors.lastname: Broholm
mesh_terms: D008280:Magnetics; D009502:Neutrons; D009942:Organometallic Compounds / Q000737:chemistry*; D044367:Phase Transition; D011726:Pyridinium Compounds / Q000737:chemistry*; D011789:Quantum Theory; D012542:Scattering, Radiation; D013113:Spin Labels
chemical_list: D009942:Organometallic Compounds; D011726:Pyridinium Compounds; D013113:Spin Labels