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Human Capital Investment, Credentialing, and Wage Differentials
* Revised: Human capital investment, Signaling, and Wage differentials[13-31, 2013
Structural Transitions and Magnetic Structure in NH4CuCl3 via 14N-NMR
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 splits below 70 K, indicating a
structural phase transition. At 4.2 K, eight N sites with distinct values of
both and the magnetic hyperfine shift 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.Comment: 7 pages, 5 figures, Proceedings for the International Symposium on
Quantum Spin Systems, submitted to Prog. Theor. Phys. Author chang
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