Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2003-05-15
Phys. Rev. Lett. vol 91, 246602-1 (2003)
Physics
Condensed Matter
Strongly Correlated Electrons
4 pages, 2 column revtex, 5 embedded figures
Scientific paper
10.1103/PhysRevLett.91.246602
We solve the double exchange model in the presence of arbitrary substitutional disorder by using a self consistently generated effective Hamiltonian for the spin degrees of freedom. The magnetic properties are studied through classical Monte Carlo while the effective exchange, $D_{ij}$, are calculated by solving the disordered fermion problem, and renormalised self-consistently with increasing temperature. We present exact results on the conductivity, magnetoresistance, optical response and `real space' structure of the inhomogeneous ferromagnetic state, and compare our results with charge dynamics in disordered La_{1-x}Sr_xMnO_3. The large sizes, ${\cal O} (10^3)$, accessible within our method allows a complete, controlled calculation on the disordered strongly interacting problem.
Kumar Sanjeev
Majumdar Pinaki
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