Mechanism of formation of half-doped stripes in underdoped cuprates

Details Mechanism of formation of half-doped stripes in underdoped cuprates Mechanism of formation of half-doped stripes in underdoped cuprates

2009-11-06

arxiv.org/abs/0911.1180v1

Physical Review B 81, 060503?R? ?(2010)?

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.81.060503

Using a variational Monte-Carlo approach with a recently proposed stripe wave function, we showed that the strong correlation included in a t-J-type model has essentially all the necessary ingredients to form these stripes with modulations of charge density, spin magnetization, and pair field. If a perturbative effect of electron-phonon coupling to renormalize the effective mass or the hopping rate of holes is considered with the model, we find the half-doped stripes, which has on the average one half of a hole in one period of charge modulation, to be most stable, energetic wise in the underdoped region, $1/12\leq\delta\leq1/8$. This is in good agreement with the observation in the neutron scattering experiments. We also find long range Coulomb interaction to be less effective in the formation of half-doped stripes.

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