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Transitions and Spin Dynamics at Very Low Temperature in the Pyrochlores Yb2Ti2O7 and Gd2Sn2O7 |
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| Authors: | Bonville P Hodges J A Bertin E Bouchaud J-Ph Dalmas de Réotier P Regnault L-P Rønnow H M Sanchez J-P Sosin S Yaouanc A |
| Institution: | (1) Department of Chemistry, Graduate School of Integrated Basic Sciences, Nihon University, Sakurajosui, Setagaya-ku, 3-25-40, Tokyo 156-8550, Japan;(2) Department of Chemistry, Faculty of Science, Kobe University, Nada-ku Kobe, 657-8501, Japan;(3) Department of Science Education, Graduate School of Education, Hiroshima University, Kagamiyama Higashi-Hiroshima, 739-8524, Japan |
| Abstract: | An orientational disorder of the cation in (PyO)D]AuCl4] crystal was investigated by the 35Cl NQR and 1H NMR measurements. A structural phase transition was found at ca. 70 K from the temperature dependence of the NQR frequencies both in (PyO)D]AuCl4] and (PyO)H]AuCl4]. Temperature dependence of the spin-lattice relaxation time T 1 of the NQR of AuCl4]− could be interpreted by an electric field gradient modulation due to the motion of the cation. Characteristics of T 1 of 35Cl NQR as well as that of 1H NMR suggest a dynamic orientational disorder of the cation. |
| Keywords: | hydrogen bond NQR order– disorder phase transition |
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