Magnetic hyperfine fields for Sn atoms in rare-earth intermetallides: huge deviation from proportionality between Bhf and Sz
✍ Scribed by N.N. Delyagin; V.I. Krylov
- Book ID
- 104166087
- Publisher
- Elsevier Science
- Year
- 2003
- Tongue
- English
- Weight
- 105 KB
- Volume
- 126
- Category
- Article
- ISSN
- 0038-1098
No coin nor oath required. For personal study only.
✦ Synopsis
The magnetic hyperfine fields for 119 Sn impurity atoms, localized in Ga sites of ferromagnetic intermetallic compounds RGa (R ¼ Pr, Nd, Sm, Gd, Tb, Dy, Ho, Er, and Tm), were measured by the Mo ¨ssbauer spectroscopy technique. At T ¼ 5 K, the hyperfine field value (B hf ) varies from 3.3 T in TmGa to 28.0 T in GdGa. Huge deviation from the proportionality between B hf and the projection of the R 3þ ion spin (S z ¼ (g 2 1)J) was found. As the atomic number of the R element increases, the B hf /S z ratio drastically decreases from 12.6 T for PrGa to 3.3 T for TmGa. This unexpected result can be explained by the strong dependency of B hf value on the relationship between the Sn-R atomic separation (R nn ) and the radius of the magnetic 4f shell (R 4f ). In the framework of this concept, the available experimental data for Sn atom in the rare-earth compounds with nonmagnetic sp elements were considered. The data may be described by the universal dependency on the single parameter, l ¼ R nn /R 4f .