Onset and melting of local orbital order

Singh, Avinash; Singh, Dishan

doi:10.1088/0953-8984/24/8/086003

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Charge and Orbitally Ordered State At Half Doping1

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2016

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“…Thus, the meanfield Hamiltonian in a four-sublattice basis 27 is given by the following 8×8 matrix form…”

Section: Charge and Orbitally Ordered State At Half Dopingmentioning

confidence: 99%

Charge Order Induced in an Orbital Density-Wave State

Singh

Takimoto

2016

J. Phys. Soc. Jpn.

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Motivated by the recent ARPES measurements (Evtushinsky et. al., PRL 105, 147201 (2010)) and evidence for the density-wave state for the charge and orbital ordering (García et al., PRL 109, 107202 (2012)) in La 0.5 Sr 1.5 MnO 4 , the issue of charge and orbital ordering in a two orbital tight-binding model for layered manganite near half doping is revisited. We find that the charge order with an ordering wavevector 2Q = (π, π) is induced by the orbital order of B 1g representation with a different ordering wavevector Q, where the primary order parameter results from the strong Fermi-surface nesting. The orbital and charge order parameters develop according to √ T CO − T and T CO − T , respectively, by decreasing the temperature below the orbital ordering temperature T CO . Moreover, the orbital order is found to stabilize the CE-type spin arrangement observed experimentally below T CE < T CO .

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“…Thus, the meanfield Hamiltonian in a four-sublattice basis 27 is given by the following 8×8 matrix form…”

Section: Charge and Orbitally Ordered State At Half Dopingmentioning

confidence: 99%