EFFECTS OF ELECTRON-ELECTRON INTERACTIONS ON NUCLEAR SPIN-LATTICE RELAXATION RATES AND KNIGHT SHIFTS IN ALKALI AND NOBLE METALS
EFFECTS OF ELECTRON-ELECTRON INTERACTIONS ON NUCLEAR SPIN-LATTICE RELAXATION RATES AND KNIGHT SHIFTS IN ALKALI AND NOBLE METALS
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DOI：
10.1103/physrev.175.373
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发表时间：
1968-01-01
期刊：
影响因子：
--
通讯作者：
WEAVER, HT
中科院分区：
文献类型：
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作者：
NARATH, A;WEAVER, HT
核磁共振数据的碱金属和贵金属的交换增强自旋晶格弛豫速率的Moriya的理论进行了讨论。现有的证据表明，在锂和钠中，由集体电子效应引起的弛豫速率增强比δ-函数势电子-电子相互作用的理论预测的小20%。这个小的差距是由于一个非零的相互作用范围，其幅度估计是小于原子半径。在本研究过程中，低温Knight-shift和自旋-晶格弛豫数据已获得的K 39，Rb 85，Rb 87，和Cs 133在各自的金属。结果表明，在这些金属中的传导电子自旋磁化率的交换增强是可比的锂和钠。类似的结论也适用于贵金属。
Nuclear-magnetic-resonance data for the alkali and noble metals are discussed in terms of Moriya's theory of exchange-enhanced spin-lattice relaxation rates. The available evidence suggests that the relaxation-rate enhancement resulting from collective electron effects is∼ 20% smaller in lithium and sodium than predicted by the theory for the case of a δ-function-potential electron-electron interaction. This small disparity is attributed to a nonzero interaction range whose magnitude is estimated to be less than an atomic radius. During the course of this study, low-temperature Knight-shift and spin-lattice relaxation data have been obtained for K 39, Rb 85, Rb 87, and Cs 133 in the respective metals. The results suggest that the exchange enhancements of the conduction-electron spin susceptibilities in these metals are comparable to those in lithium and sodium. Similar conclusions apply in the case of the noble metals.