Low-Temperature Resistivity in a Nearly Half-Metallic Ferromagnet

Journal Article · Sat May 01 04:00:00 EDT 1999 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.82.4276· OSTI ID:700973

Wang, X ^[1]; Zhang, X ^[2]

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1. Metals and Ceramics Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6114 (United States)
2. Computational Physics and Engineering Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831 (United States)

In a nearly half-metallic ferromagnet, such as a material exhibiting {open_quotes}colossal{close_quotes} magnetoresistance, the minority spin electrons close to the band edge at the Fermi energy are Anderson localized due to disorder; thus only majority electrons conduct current. This presents a unique electronic structure for which the linear response Boltzmann equation involving the scattering of a single magnon is exactly solvable. The solution yields a temperature dependent resistivity that scales as T{sup 2.5} above approximately 60thinspthinspK and contains a T{sup 1.5} contribution below this temperature, and has a dependence on the magnetic field consistent with experiments. {copyright} {ital 1999} {ital The American Physical Society}

• Research Organization: Oak Ridge National Laboratory
• DOE Contract Number: AC05-96OR22464
• OSTI ID: 700973
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 21 Vol. 82; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BOLTZMANN EQUATION
CHARGED-PARTICLE TRANSPORT
ELECTRIC CONDUCTIVITY
FERROMAGNETIC MATERIALS
MAGNETORESISTANCE
MAGNONS