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.T18.2

Abstract: T18.00002 : Random Exchange Antiferromagnetic Heisenberg Chains

3:06 PM–3:18 PM

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Authors:

  Christopher Landee
    (Department of Physics and Carlson School of Chemistry, Clark University)

  Fan Xiao
    (Department of Physics and Carlson School of Chemistry, Clark University)

  Brian Wells
    (Department of Physics and Carlson School of Chemistry, Clark University)

  Brian Koopman
    (Department of Physics and Carlson School of Chemistry, Clark University)

  Mark Turnbull
    (Department of Physics and Carlson School of Chemistry, Clark University)

  Matthias Thede
    (Laboratorium f\"ur Festk\"orperphysik, ETH, Z\"urich, Switzerland)

  Andrey Zheludev
    (Laboratorium f\"ur Festk\"orperphysik, ETH, Z\"urich, Switzerland)

Copper \textit{bis}pyridine dichloride (CPC) and copper \textit{bis}pyridine dibromide (CPB) are isostructural Heisenberg S = $\raise.5ex\hbox{$\scriptstyle 1$}\kern-.1em/ \kern-.15em\lower.25ex\hbox{$\scriptstyle 2$} $ linear chains in which the copper atoms are bridged by two halides with the pyridine molecules in the axial sites. The exchange strengths are 27 K (CPC) and 45 K (CPB). We have prepared mixed halide versions Cu(py)$_{2}$[Cl$_{1-x}$Br$_{x}$]$_{2}$ for values of x from 0 to 1. We will report on the effect of the exchange randomness on the susceptibilities and N\'{e}el temperatures of this family of compounds, as determined by dc-magnetometry, muon spin relaxation, and low-temperature calorimetry.

To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2011.MAR.T18.2