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首页> 外文期刊>Zeitschrift fur Naturforschung. A, A journal of physical sciences >NQR and NMR Studies of Phase Transitions in R_2Pb [Cu (NO_2)_6] (R = K, Rb, Tl, Cs, and NH_4)
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NQR and NMR Studies of Phase Transitions in R_2Pb [Cu (NO_2)_6] (R = K, Rb, Tl, Cs, and NH_4)

机译：R_2Pb [Cu（NO_2）_6]（R = K，Rb，Tl，Cs和NH_4）中相变的NQR和NMR研究

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摘要

~(39)K, ~(87, 85)Rb, ~(133)Cs, ~(205)Tl, and ~(1, 2)H NMR spin-lattice relaxation times T_1 and ~(14)N NQR spin-lattice relaxation times T_(1Q) were determined for R_2Pb[Cu(NO_2)_6] (R = K, Rb, Tl, Cs, and NH_4). T_1 of ~(39)K and ~(87)Rb showed very short values in the incommensurate phase as compared with those in the other phases. When the commensurate-incommensurate phase transition point is approached from below, ~(14)N T_(1Q) of the R = K, Rb, Tl, and NH_4 compounds showed rapid decrease. On the other hand, that of the R = Cs compound began to decrease first after passing beyond the corresponding transition point. The difference of the T_(1Q) behavior may be ascribed to the difference of the condensed phonon mode in the incommensurate phase.
机译：〜（39）K，〜（87，85）Rb，〜（133）Cs，〜（205）Tl和〜（1，2）H NMR自旋晶格弛豫时间T_1和〜（14）N NQR自旋-确定了R_2Pb [Cu（NO_2）_6]的晶格弛豫时间T_（1Q）（R = K，Rb，Tl，Cs和NH_4）。 〜（39）K和〜（87）Rb的T_1在不相称相中显示出与其他相相比极短的值。当从下方接近相称相变点时，R = K，Rb，Tl和NH_4化合物的〜（14）N T_（1Q）迅速降低。另一方面，R = Cs化合物的化合物在超过相应的转变点后首先开始降低。 T_（1Q）行为的差异可以归因于在不相称的阶段中凝聚声子模式的差异。

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