Charged vortex structure in high-temperature superconductors

doi:10.1088/1674-1056/19/2/027401

Abstract By using a model Hamiltonian with competing antiferromagnetic (AFM) spin density wave (SDW) and d-wave superconductivity orders, the effect of next-nearest-neighbour (nnn) hopping on spin and charge structures in high-temperature superconductors is investigated at finite temperatures. For an optimally doped sample, we find that the AFM order magnitude in the vortex core is firstly enhanced and then suppressed, accompanied with a ``positively → negatively → positively" charged vortex structure transition with increasing nnn hopping strength, which implies that the AFM order is unnecessarily bounded to an electron-rich vortex core. In addition, a charge ordering pattern with four negatively charged peaks localized in a small region is also found around the vortex core centre without net charge. Recent scanning-tunneling-microscopy experimental observations of the checkerboard structure are hopefully understood.

Keywords: vortex charge next-nearest-neighbouring hopping Bogoliubov-de Gennes equation

Received: 12 January 2009
Revised: 13 May 2009
Accepted manuscript online:

PACS:	74.25.Qt
	74.25.Ha	(Magnetic properties including vortex structures and related phenomena)
	75.60.Ej	(Magnetization curves, hysteresis, Barkhausen and related effects)
	74.72.Bk
	74.72.Dn
	74.72.Hs

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 60671042) and by Innovation Funds of Shanghai University, China.

Cite this article:

Zha Guo-Qiao(査国桥) and Zhou Shi-Ping(周世平) Charged vortex structure in high-temperature superconductors 2010 Chin. Phys. B 19 027401

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Charged vortex structure in high-temperature superconductors

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