ISSN:
1434-6036
Keywords:
PACS. 74.20.-z Theories and models of superconducting state – 71.45.Lr Charge-density-wave systems – 71.10.Hf Non-Fermi-liquid ground states, electron phase diagrams and phase transitions in model systems
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract: Using a strong coupling approach, based on a Cumulant Expansion, we investigate the stripe orders driven by nearest-neighbor Coulomb (NNC) interaction in the Hubbard model. When we consider only local Coulomb repulsion, critical charge fluctuations drive the system towards a phase separation (PS). Such density instability evolves into an incommensurate charge density wave (ICDW) when nonlocal Coulomb interactions are taken into account, similarly to the case when long-range Coulomb forces are considered. In particular, we find a stripe phase with a crossover from diagonal to vertical stripes in the doping region 0.03 ?x? 0.2, similarly to neutron scattering experiments on La 2 - x Sr x CuO 4. Analogous strong dependence in the stripe direction is observed at varying the NNC interaction.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/s100510170112
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