Magneto-optical evidence of double exchange in a percolating lattice

Details Magneto-optical evidence of double exchange in a percolating lattice Magneto-optical evidence of double exchange in a percolating lattice

2005-10-06

arxiv.org/abs/cond-mat/0510155v1

Phys. Rev. Lett. 96, 016403 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

10 pages, 3 figures

Scientific paper

10.1103/PhysRevLett.96.016403

Substituting $Eu$ by $Ca$ in ferromagnetic $EuB_6$ leads to a percolation limited magnetic ordering. We present and discuss magneto-optical data of the $Eu_{1-x}Ca_{x}B_6$ series, based on measurements of the reflectivity $R(\omega)$ from the far infrared up to the ultraviolet, as a function of temperature and magnetic field. Via the Kramers-Kronig transformation of $R(\omega)$ we extract the complete absorption spectra of samples with different values of $x$. The change of the spectral weight in the Drude component by increasing the magnetic field agrees with a scenario based on the double exchange model, and suggests a crossover from a ferromagnetic metal to a ferromagnetic Anderson insulator upon increasing $Ca$-content at low temperatures.

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