Composite Spin Waves, Quasi-Particles and Low Temperature resistivity in Double Exchange Systems

Details Composite Spin Waves, Quasi-Particles and Low Temperature resistivity in Double Exchange Systems Composite Spin Waves, Quasi-Particles and Low Temperature resistivity in Double Exchange Systems

2000-10-20

arxiv.org/abs/cond-mat/0010312v1

Physical Review B, Rapid Communications 64, 140403 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, REVTEX

Scientific paper

10.1103/PhysRevB.64.140403

We make a quantum description of the electron low temperature properties of double exchange materials. In these systems there is a strong coupling between the core spin and the carriers spin. This large coupling makes the low energy spin waves to be a combination of ion and electron density spin waves. We study the form and dispersion of these composite spin wave excitations. We also analyze the spin up and down spectral functions of the temperature dependent quasi-particles of this system. Finally we obtain that the thermally activated composite spin waves renormalize the carriers effective mass and this gives rise to a low temperature resistivity scaling as T ^{5/2}.

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