Low-temperature electrical transport and double exchange in La(Pb,Ca)MnO
M. Jaime, P. Lin, M.B Salamon, and P. Han (Department of Physics and, Materials Research Laboratory, University of Illinois at Urbana-Champaign,, USA. MJ present address: Los Alamos National Laboratory, Los Alamos, NM, USA)
TL;DR
This study investigates the low-temperature electrical transport in La(Pb,Ca)MnO_3, revealing a transition in resistivity behavior linked to double exchange ferromagnetism and magnon scattering processes.
Contribution
It provides new insights into the temperature-dependent resistivity and Seebeck coefficient in flux-grown La(Pb,Ca)MnO_3, highlighting the role of magnon scattering cut-off.
Findings
Resistivity shows quadratic temperature dependence above 50 K.
Resistivity becomes temperature independent below 20 K.
Seebeck coefficient exhibits a regime change at similar temperature.
Abstract
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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