We report on the temperature variation of the interatomic distances in isostructural U2Ni2In and U2Pd2Sn, both of which order antiferromagnetically at low temperatures. Both compounds exhibit complex non-collinear arrangements of the magnetic moments confined to the tetragonal basal plane, which is perpendicular to the shortest interuranium distance along the c-axis at low temperatures. The different temperature dependencies of the shortest interatomic links between uranium and the transition metal (Ni or Pd) provide evidence for the dual nature of 5f-d hybridization in these two compounds. We argue that magnetic ordering in U 2Pd2Sn arises due to increased 5f-d hybridization (promoting stronger exchange) while the reduced hybridization in U 2Ni2In allows for the formation of stable U magnetic moments.
|Original language||English (US)|
|Number of pages||4|
|Journal||Journal of Alloys and Compounds|
|State||Published - Apr 28 2004|
|Event||Proceedings of the VI Latin American Workshop on Magnetism - Chihuahua, Mexico|
Duration: Apr 7 2003 → Apr 11 2003
Bibliographical noteFunding Information:
This work was supported by the NSF (grant number: DMR-0094241) and the BES program of the US Department of Energy. The work of V. Sechovsky and K. Prokes is a part of the research program MSM 113200002 financed by the Department of Education of the Czech Republic.
- Heavy fermions
- Neutron scattering/diffraction