Low-temperature electrical transport and double exchange in La(Pb,Ca)MnO

Los Alamos; Materials Research Laboratory; M.B Salamon; M. Jaime; NM; P. Han (Department of Physics; P. Lin; University of Illinois at Urbana-Champaign; USA); USA. MJ present address: Los Alamos National Laboratory

arxiv: cond-mat/9709305 · v3 · submitted 1997-09-27 · ❄️ cond-mat.str-el

Low-temperature electrical transport and double exchange in La(Pb,Ca)MnO

M. Jaime , P. Lin , M.B Salamon , P. Han (Department of Physics , Materials Research Laboratory , University of Illinois at Urbana-Champaign , USA. MJ present address: Los Alamos National Laboratory , Los Alamos

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keywords temperatureresistivitysingleaboveattributebandsbehaviorbelow

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The resistivity in the ferromagnetic state of flux-grown La_{2/3}(Pb,Ca)_{1/3}MnO_3 single crystals, measured in magnetic fields up to 7 T, reveals a strong quadratic temperature dependence at and above 50 K. At lower temperatures, this contribution drops precipitously leaving the resistivity essentially temperature independent below 20 K. The Seebeck coefficient also reflects a change of regime at the same temperature. We attribute this behavior to a cut-off of single magnon scattering processes at long wavelengths due to the polarized bands of a double-exchange ferromagnet.

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Low-temperature electrical transport and double exchange in La(Pb,Ca)MnO

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