Transferred hyperfine field

Here Aa b, Ac are the on-site hyperfme field, and B and C are the transferred hyperfine field from the neighbouring Cu spin. When x (q, oj) has a sharp peak at q = Q and Lorentzian-type energy dependence, y (q, to) is expressed as... 

NMR spectroscopy was furthermore applied to investigate hyperfine fields at Fe and B sites in R2T14B compounds with R = Sm, Gd, Lu and T = Fe and Co. The transferred hyperfine fields at B sites was reported to reflect changes in the magnetic structure of these compounds and was discussed in terms of dipolar fields (Erdmann et al. 1988). 

Correlation of magnetic ordering temperatures and transferred hyperfine fields... 

As is evident from a comparison of eqs. (lid) and (lie), there is also a direct empirical access to the conduction electron spin polarization, if magnetic ordering temperatures and transferred hyperfine fields at the R site are compared. Both quantities contain the spin polarization at the R site, induced by all the other R electronic spins... 

In ferromagnetic materials the magnetic field experienced by the nucleus is much larger than in the paramagnetic materials discussed above. This hyperfine field can be determined experimentally by sweeping the resonance frequency in zero external field. There are several contributions to These comprise contributions due to core polarization of the inner s shell by the net d-spin or f-spin density and contributions due to conduction electron polarization by the atomic moment associated with the nucleus under consideration (/fj and a contribution due to conduction electron polarization caused by the atomic moments of the surrounding atoms H ). This latter contribution is often referred to as the transferred hyperfine field. Adding up, one therefore has... 

Leithe-Jasper et al. (1994) report on the " Sn Mossbauer spectra of the RMnSn2 (R = La, Ce, Pr, Nd, Sm) stannides. The compounds order magnetically close to room temperature. At the two tin sites there is a transferred hyperfine field of 3-6 T at 15 K, which depends on the rare-earth partner, especially at the Sn2 sites. 

SmSe SmSiSei, Se NMR transferred hyperfine field in paramagnetic state Brog and Kenan (1973)... 

Bykovetz (1976) has utilized the NGR of Sn to study transferred hyperfine fields at the Sn site in solid solutions of EuS, EuSe, and EuTe with the corresponding tin monochalcogenides. The transferred hyperfine fields, on the order of 50 kOe at 4.2 K, in dilute solid solutions were shown to be supertrans-ferred from the second Eu neighbors. 

Large negative shifts of the NMR were observed by Brog et al. (1973) in SmSe and SmS,jSei i and were found to be correlated with the expectation value of the rare-earth spin. For SmSe the transferred hyperfine field at the Se site was found to be - 29 4 kOe per unit 4f spin. 

The NMR of a number of non-RE nuclei, primarily F, A1, P, and V, has been utilized to gain information on transferred hyperfine fields and the extent of covalent bonding contributions in a variety of insulating compounds, such as the aluminates, orthophosphates, orthovanadates, the mixed fluorides (e.g., LiRf4), and others. Representative examples are included in the listing in table 18.24. 

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