ФТТ, 2007, том 49, выпуск 7
ФТТ, 2007, том 49, выпуск 7
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Na spin-lattice relaxation in powder Rochelle salt
ChengTien, E.V.Charnaya, M.K.Lee, S.V.Baryshnikov
Department of Physics, National Cheng Kung University,
70101 Tainan, Taiwan
Institute of Physics, St. Petersburg State University,
198504 St. Petersburg, Petrodvorets, Russia
Blagoveshchensk State Pedagogical University,
675002 Blagoveshchensk, Russia
E-mail: charnaya@mail.ru
(Received October 25, 2006).
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The temperature dependence of Na 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 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 Na 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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