Temperature dependence of the Knight shift

The Knight shift of Cu in high-7) materials decreases below 7) indicating the singlet pairing as in Fig. 14. The temperature dependence of the Knight shift is also reproduced by the same NS(E) as in the case of 1/7) as shown in Fig. 16. 

The results have been reported of a comparative study of the measured electrical resistivities of liquid alkali metals and alloys, and the theoretical predictions for this quantity obtained within the diffraction model.48 The composition dependence of the Knight shifts in Na-Cs, Na-Rb, K-Rb-Cs, and Na-Rb-Cs liquid alloys has also been examined.49 Addition of small quantities of rubidium (0.3—4.51 atom %) to liquid sodium increases the electrical resistivity almost linearly with increasing solute concentration. With increasing temperature from 100 to 1100 °C, the effect of rubidium on the resistivity of sodium progressively diminishes.50 Addition of the solutes Hg, Tl, and Pb increases the resistivity of liquid potassium linearly with both increasing concentration and temperature. The unit increases in resistivity/pfl cm (atom%) , are 8.80, 9.85, and 15.8 for Hg, Tl, and Pb,... 

Fig. 53. Temperature-dependence of the l70 Knight shift for S RutTi with Tc = 1.48 K.111 Kjj, and Kc denote K values along and perpendicular to the Ru—O—Ru bonding axis, and K along the c-axis, respectively.

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