Temperature dependence of the Knight

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.

The temperature dependence of the light-induced ESR is relatively weak, especially below 100°K where the intensity is essentially constant (Biegelsen and Knights, 1977). The ESR signals increase rapidly after the light is... 

Fig. 151. Temperature dependence of the nSR frequency in UPd2Al3 in an external field of 1T applied in two directions near and below the superconducting transition (i.e., always in the magnetically ordered state). The line) marks the frequency of a free muon. The dashed lines give the general Knight shift in the magnetic state. Note that changes in shift occur at the superconducting nansition temperature (Tj) whose sign depends on field orientation. From Feyerherm et al. (1994a).

Fig. 167. Temperature dependence of the muon Knight shift of CeSnj. The solid line represents the variation of bulk susceptibility with temperature. After Wehr et al. (1984).

Pronounced crystal-field effects were observed in the paramagnetic phase NMR for intermetallic compounds of Ce, Pr, Sm or Tm. Crystal-field effects for Tm in TmAlj have been analysed by de Wijn et al. (1970) by a combination of the temperature dependences of the Al Knight shift and of the magnetic susceptibility. These authors also analysed the quadrupole interaction for the Al site in the cubic CujAu structure. Comparing the experimental value e qQ/h = 7.6 MHz with the point-charge model value (Abragam 1961)... 

---