Volume 84, Number 1, October 2008
|Number of page(s)||5|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||19 September 2008|
Spin and charge structures around vortices in underdoped high-temperature superconductors
Department of Physics, Shanghai University - 99 Shangda Road, Shanghai 200444, PRC
Corresponding author: firstname.lastname@example.org
Accepted: 25 August 2008
The effect of next-nearest-neighbor (nnn) hopping on the spin and charge structures around vortices in underdoped high-temperature superconductors is studied at finite temperature by numerically solving the Bogoliubov-de Gennes equations based on a model Hamiltonian with competing antiferromagnetic spin density wave (SDW) and d-wave superconductivity orders. We show that one-dimensional (1D) y- or x-axisoriented stripes for the SDW and the associated charge density wave (CDW) exist for small nnn hopping strengths. A coexistence of both y- and x-axisoriented stripes may occur for a relatively large nnn hopping strength. The two-dimensional (2D) spatial modulations with fourfold symmetry can be obtained with further enlarging nnn hopping strength, implying the possible existence of 2D checkerboard-like SDW and CDW orders. In addition, a transition of “1D stripe to 2D checkerboard-like pattern” can take place with increasing temperature.
PACS: 74.20.-z – Theories and models of superconducting state / 74.25.Jb – Electronic structure / 74.25.Ha – Magnetic properties
© EPLA, 2008
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