Session T18: Focus Session: Low D/Frustrated Magnetism - Molecular Magnets II

2:30 PM–5:30 PM, Wednesday, March 23, 2011
Room: D172

Sponsoring Units: GMAG DMP
Chair: M. Sarachik, City College of New York

Abstract ID: BAPS.2011.MAR.T18.12

Abstract: T18.00012 : Magnetization measurements of a two-leg spin-1/2 ladder with strong leg interactions

5:06 PM–5:18 PM

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Authors:

  K. Ninios
    (University of Florida)

  Tao Hong
    (Oak Ridge National Laboratory)

  S.N. Herringer
    (Clark University)

  M.M. Turnbull
    (Clark University)

  C.P. Landee
    (Clark University)

  Y. Takano
    (University of Florida)

  H.B. Chan
    (The Hong Kong University of Science and Technology)

We have measured the magnetization of a single crystal of the spin-1/2 ladder compound bis(2,3-dimethylpyridinium) tetrabromocuprate (DIMPY), using micromechanical force magnetometry down to 30mK. DIMPY undergoes a quantum phase transition from a gapped phase with no long--range magnetic order to a gapless phase, at critical field Hc. Recent specific heat results by Hong et al. show that the gapless phase is a Tomonaga-Luttinger liquid (TLL). Low temperature magnetic susceptibility as a function of field exhibits a maximum near Hc, in consistence with the divergence of the zero temperature susceptibility at Hc expected for an ideal 1-D system. A clear minimum in the magnetization of the gapless phase as a function of temperature is observed, a minimum that marks the limit below which the TLL exists. In addition the field dependence of the TLL parameter K is studied.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.T18.12