Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
2006-09-28
Phys. Rev. B {\bf 75}, 014209 (2007)
Physics
Condensed Matter
Strongly Correlated Electrons
10 pages, 9 figures
Scientific paper
10.1103/PhysRevB.75.014209
We study a two dimensional, two-band double-exchange model for $e_g$ electrons coupled to Jahn-Teller distortions in the presence of quenched disorder using a recently developed Monte-Carlo technique. In the absence of disorder the half-filled system at low temperatures is an orbitally ordered ferromagnetic insulator with a staggered pattern of Jahn-Teller distortions. We examine the finite temperature transition to the orbitally disordered phase and uncover a qualitative difference between the intermediate and strongly coupled systems, including a thermally driven insulator to metal crossover in the former case. Long range orbital order is suppressed in the presence of disorder and the system displays a tendency towards metastable states consisting of orbitally disordered stripe-like structures enclosing orbitally ordered domains.
Kampf Arno P.
Kumar Sanjeev
Majumdar Pinaki
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