Mechanism of the Giant Magnetoresistance in UNiGa from First-Principles Calculations

Journal Article · Sun Dec 01 04:00:00 EST 1996 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.77.5253· OSTI ID:404098

Antonov, V N; Perlov, A Y; Oppeneer, P M; Yaresko, A N; Halilov, S V ^[1]

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1. Max-Planck Research Group ``Theory of Complex and Correlated Electron Systems,`` University of Technology, D-01062 Dresden (Germany)

The giant magnetoresistance (MR) in UNiGa is investigated from first principles, using density-functional band-structure theory in the local approximation together with a linear-response ansatz for the conductivity. The MR is calculated to be very anisotropic, with a large value of {minus}(45{plus_minus}5){percent} for current in plane and a giant MR of {minus}(64{plus_minus}5){percent} for current perpendicular to plane. These values are in semiquantitative agreement with the measured MR. The basic mechanism of the giant MR is identified to be a superzone reconstruction of the Fermi surface at the field induced metamagnetic transition. {copyright} {ital 1996 The American Physical Society.}

• OSTI ID: 404098
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 26 Vol. 77; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANISOTROPY
ENERGY GAP
FERMI LEVEL
GALLIUM ALLOYS
MAGNETORESISTANCE
NICKEL ALLOYS
URANIUM ALLOYS