µSR08

In July 2008, I attended µSR08, the 11th International Conference on Muon Spin Rotation, Relaxation and Resonance in Tsukuba, Japan. I presented a poster which can be downloaded here.

The two-dimensional Heisenberg antiferromagnet CuF2(H2O)2(pyz) studied with muon spin rotation

A. J. Steele1, T. Lancaster1, S.J. Blundell1, F.L. Pratt2, and J.L. Manson3

  1. 1 Oxford University Department of Physics, Parks Road, Oxford. OX1 3PU, UK
  2. 2 ISIS Facility, Rutherford Appleton Laboratory, Chilton, Oxordshire. OX11 0QX, UK
  3. 3 Department of Chemistry and Biochemistry, Eastern Washington University, Cheney. WA99004, USA

Muon spin rotation (µ+SR) has been used to investigate the new coordination polymer CuF2(H2O)2(pyz). The material comprises one-dimensional linear chains of CuF2O2N2 octrahedra connected via pyrazine bridges, which are tethered by hydrogen bonds to form a quasi–two-dimensional square lattice of S = ½ Cu2+ ions. µ+SR provides a unique probe of magnetic order in low-dimensional systems, elucidating behaviour which is ambiguous to bulk techniques such as heat capacity or susceptibility measurements. Our data show the onset of magnetic order at TN = 2.62 K, below which we observe oscillations in the positron asymmetry spectra at three distinct frequencies. Spectra above the transition show low-frequency µ–F oscillations due to entangled dipole–dipole states of a muon and a fluorine nuclear spin which are useful in locating implanted muons. We discuss the critical behaviour of this material and likely muon sites.

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