Вышедшие номера
23Na spin-lattice relaxation in powder Rochelle salt
Tien Cheng1, Charnaya E.V.1,2, Lee M.K.1, Baryshnikov S.V.3
1Department of Physics, National Cheng Kung University, Tainan Taiwan
2Institute of Physics, St. Petersburg State University, St. Petersburg, Petrodvorets, Russia
3Blagoveshchensk State Pedagogical University, Blagoveshchensk, Russia
Email: charnaya@mail.ru
Поступила в редакцию: 25 октября 2006 г.
Выставление онлайн: 19 июня 2007 г.

The temperature dependence of 23Na spin-lattice relaxation in the polycrystalline Rochelle salt was studied by NMR within the range from 235 to 320 K covering both Curie points. The spin-relaxation time t1 versus temperature curve showed noticeable dips near the phase transitions against the background of the regular decrease in the relaxation time upon increasing temperature. The dips observed were ascribed to critical contributions to sodium spin-lattice relaxation caused by the slowdown of the correlation time for one of two relaxation modes in the Rochelle salt. The 23Na NMR parameters were also measured for the melted Rochelle salt. The present work was supported by National Cheng Kung University (Taiwan), under Grand OUA 95-21T-2-017, by DFG (Germany), and RFBR (Russia). PACS: 77.80.Bh, 64.60.-i, 64.70.Kb, 75.40.-s
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