In:
Journal of Applied Physics, AIP Publishing, Vol. 81, No. 8 ( 1997-04-15), p. 5538-5538
Abstract:
Based on the coherent electronic structure of the ideal crystal, the “giant” magnetoresistance (GMR) of UNiGa and U2Pd2X (X=In, Sn) at the field-induced transition from the antiferromagnetic ground state to the ferromagnetic state is calculated using linear transport theory. Assuming that the scattering is well represented by a single averaged relaxation time, good agreement with experimental data is obtained for the GMR of UNiGa. The effect can be understood from topological changes of particular Fermi surface sheets at the magnetic transition, bringing about conductivity changes of a factor of 2. No experimental data are available for the high-field resistivity of U2Pd2X. Here, in contrast to UNiGa, the Brillouin zone is invariant under the metamagnetic transition. Nonetheless, conductivity changes up to a factor of 2 are found, again caused by changed connectivity of the Fermi surface. Moreover, we predict the possibility of an inverse GMR effect for this system without introducing spin-dependent scattering. The latter is shown to have minor influence due to strong spin–orbit coupling.
Type of Medium:
Online Resource
ISSN:
0021-8979
,
1089-7550
Language:
English
Publisher:
AIP Publishing
Publication Date:
1997
detail.hit.zdb_id:
220641-9
detail.hit.zdb_id:
3112-4
detail.hit.zdb_id:
1476463-5