Charged vortex structure in high-temperature superconductors

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

中国物理B ›› 2010, Vol. 19 ›› Issue (2): 27401-027401.doi: 10.1088/1674-1056/19/2/027401

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇下一篇

Charged vortex structure in high-temperature superconductors

査国桥, 周世平

Department of Physics, Shanghai University, Shanghai 200444, China

收稿日期:2009-01-12 修回日期:2009-05-13 出版日期:2010-02-15 发布日期:2010-02-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant No. 60671042) and by Innovation Funds of Shanghai University, China.

Charged vortex structure in high-temperature superconductors

Zha Guo-Qiao(査国桥)^† and Zhou Shi-Ping(周世平)

Department of Physics, Shanghai University, Shanghai 200444, China

Received:2009-01-12 Revised:2009-05-13 Online:2010-02-15 Published:2010-02-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant No. 60671042) and by Innovation Funds of Shanghai University, China.

摘要/Abstract

摘要： 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.

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.

Key words: vortex charge, next-nearest-neighbouring hopping, Bogoliubov-de Gennes equation

中图分类号:

74.25.Qt

74.25.Ha (Magnetic properties including vortex structures and related phenomena) 75.60.Ej (Magnetization curves, hysteresis, Barkhausen and related effects)

査国桥, 周世平. Charged vortex structure in high-temperature superconductors[J]. 中国物理B, 2010, 19(2): 27401-027401.

Zha Guo-Qiao(査国桥) and Zhou Shi-Ping(周世平). Charged vortex structure in high-temperature superconductors[J]. Chin. Phys. B, 2010, 19(2): 27401-027401.

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Charged vortex structure in high-temperature superconductors

Charged vortex structure in high-temperature superconductors

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