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Tunneling motions of methyl groups in manganese acetate tetrahydrate |
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| Authors: | A Heidemann S Clough P J McDonald A J Horsewill K Neumaier |
| Institution: | (1) Institut Laue-Langevin, 156X-Avenue des Martyrs, F-38042 Grenoble Cedex, France;(2) Department of Physics, University of Nottingham, NG 7 2 RD Nottingham, UK;(3) Walther-Meissner-Institut für Tieftemperaturforschung, Bayerische Akademie der Wissenschaften, Walther-Meissner-Strasse 8, D-8046 Garching, Federal Republic of Germany |
| Abstract: | The temperature dependence of the tunneling motions of the methyl groups in Manganese Acetate Tetrahydrate has been studied by high resolution inelastic neutron scattering in a range between 0.06 K and 40 K. The results are in qualitative agreement with models based on rotor-phonon and rotor-rotor coupling valid for temperature regions above and below 5 K respectively. The finite line width of one of the tunneling lines which persists at very low temperatures and the anomalous positive shift of the same line at higher temperatures is not understood. |
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