NMR Study of 17 O Transverse Relaxation in YBa 2 Cu 3 s 16 O 1 2 c 17 O c d 7
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چکیده
Amit Keren, Henri Alloul, Philippe Mendels, and Yohsuke Yoshinari* Laboratoire de Physique des Solides, URA2 CNRS, Université Paris Sud, 91405 Orsay, France (Received 9 October 1996) NMR transverse relaxation (TR) measurements of 17Os2, 3d in YBa2Cu3sO12cOcd7 are presented. A Gaussian-like relaxation is found. The origin of this relaxation is investigated by varying c, the temperature, the external field, and by comparing it with the 17Os4d site. Our results are consistent with a model in which this relaxation is caused by the dynamical fluctuation of copper nuclei, including both spin-lattice and flip-flop processes. With this model we can also explain the TR of 89Y and 63Cus1d. We use our results to reanalyze previous NMR 63Cus2d TR data and find the dynamical exponent z 1. [S0031-9007(97)02758-0]
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تاریخ انتشار 1997