NMR study of molecular reorientations in NH4H2AsO4 |
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Authors: | R Grosescu |
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Institution: | Max-Planck-Institute, Department of Molecular Physics, 6900 Heidelberg, Germany |
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Abstract: | Zeeman (T1Z) and dipolar (T1D) spin-lattice relaxation times of protons in NH4H2AsO4 were measured as a function of temperature. The existence of a slow motion (τ ≈ 10?3 see) is established, which is most probably a low frequency hindered reorientation of H2AsO4 groups. This motion is slowed down below the Curie point Tc. A sharp increase of the dipolar relaxation rate above T = 314°K indicates the possibility of a new high temperature phase transition in this compound. |
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