Structural Transitions and Magnetic Structure in NH4CuCl3 via 14N-NMR

Details Structural Transitions and Magnetic Structure in NH4CuCl3 via 14N-NMR Structural Transitions and Magnetic Structure in NH4CuCl3 via 14N-NMR

2005-01-19

arxiv.org/abs/cond-mat/0501451v2

Physics

Condensed Matter

Strongly Correlated Electrons

7 pages, 5 figures, Proceedings for the International Symposium on Quantum Spin Systems, submitted to Prog. Theor. Phys. Autho

Scientific paper

We report results of 14N-NMR experiments on NH4CuCl3 at the magnetic field of 7 T, where the 1/4-magnetization plateau is observed at low temperatures. The quadrupole splitting parameter $\nu_{z}$ splits below 70 K, indicating a structural phase transition. At 4.2 K, eight N sites with distinct values of both $\nu_{z}$ and the magnetic hyperfine shift $K_{z}$ are resolved in the NMR spectrum for general field directions. We then conlude that the magnetic structure in the 1/4-plateau does not break the symmetry of the crystal. Based on the NMR and the recent neutron scattering results by Ruegg et al. [Phys. Rev. Lett. 93 (2004) 037207], we propose that triplet dimers in the 1/4-plateau is formed not between the nearest neighbor pairs but over different chains.

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