Session H16: Focus Session: 2D Quantum Magnetism

8:00 AM–11:00 AM, Tuesday, March 6, 2007
Colorado Convention Center - Korbel 4F

Sponsoring Unit: GMAG
Chair: Igor Zaliznyak, Brookhaven National Laboratory

Abstract ID: BAPS.2007.MAR.H16.5

Abstract: H16.00005 : Field dependent ordering temperature in copper pyrazine perchlorate, Cu(pz)$_{2}$(ClO$_{4}$)$_{2}$

8:48 AM–9:00 AM

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Authors:

  Christopher Landee
    (Clark University)

  Fan Xiao
    (Clark University)

  Mark Turnbull
    (Clark University)

  N. Tsyrulin
    (ETH, Zurich, Switzerland)

  Michel Kenzelmann
    (ETH, Zurich, Switzerland)

  Hans Van Tol
    (National High Magnetic Field Laboratory, Florida)

Copper pyrazine perchlorate is a molecular-based 2D S=1/2 Heisenberg antiferromagnet (QHAF) with a moderate exchange constant (J/k = 17.5 K) and a saturation field of 60 T. The zero-field ordering temperature, as recently determined by muon spin relaxation experiments [1], is 4.3 K corresponding to excellent isolation (J$'$/J $\approx $ 8x10$^{-4})$ between magnetic layers [2]. Recent studies of Cu(pz)$_{2}$(ClO$_{4})_{2}$ in applied fields (specific heat and ESR) show the ordering transition to increase with field by as much as 30{\%} in a field of nine tesla. This effect will be discussed in terms of a field-induced anisotropy crossover model [3]. 1. T. Lancaster, S. J. Blundell et al, submitted for publication. 2. P. Sengupta, A. W. Sandvik, and R. R. P. Singh, Phys. Rev. B \textbf{68}, 094423 (2003). 3. A. Cuccoli et al, Phys. Rev. B \textbf{68}, 060402 (2003).

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.MAR.H16.5