Low-temperature Electrical Transport and Double Exchange in Typeset Using Revt E X
نویسندگان
چکیده
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 behavior at the same temperature. We attribute this behavior to a cutoff of single magnon scattering processes at long wavelengths due to the polarized bands of a double-exchange ferromagnet.
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تاریخ انتشار 2008