Low-temperature resistivity in double-exchange systems - art. no. 140403

We make a quantum description of the electron low-temperature properties of double-exchange materials. In these systems there is a strong coupling bet ween the core spin and the carriers spin. This large coupling makes the low energy spin waves a combination of ion and electron density spin waves. We also analyze the spin up and down spectral functions of the temperature-de pendent quasiparticles of this system. Finally we analyze the low-temperatu re resistivity of these systems. We find that static hopping amplitude diso rder couples with the spin fluctuations and produces a low-temperature resi stivity scaling as T-3/2 whose magnitude agrees with experimental data.