{bold {ital Ab initio}} calculations of the {open_quotes}giant{close_quotes} magnetoresistance in uranium intermetallics (abstract)
- Max-Planck-Gesellschaft, PG Research Group Electron Systems, University of Technology, D-01062 Dresden (Germany)
- Institute of Metal Physics, Academy of Sciences of Ukraine, 252142 Kiev (Ukraine)
- Institute of Theoretical Physics, University of Technology, D-01062 Dresden (Germany)
- Max-Planck-Gesellschaft, Research Group Electron Systems, University of Technology, D-01062 Dresden (Germany)
- Department of Physics, Charles University, Ke Karlovu 5, 121 16 Prague 2 (Czech Republic)
Based on the coherent electronic structure of the ideal crystal, the {open_quotes}giant{close_quotes} magnetoresistance (GMR) of UNiGa and U{sub 2}Pd{sub 2}X (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 U{sub 2}Pd{sub 2}X. 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{endash}orbit coupling. {copyright}{ital 1997 American Institute of Physics.}
- OSTI ID:
- 496605
- Report Number(s):
- CONF-961141--
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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