Issue
EPL
Volume 87, Number 3, August 2009
Article Number 37009
Number of page(s) 6
Section Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI http://dx.doi.org/10.1209/0295-5075/87/37009
Published online 28 August 2009
EPL, 87 (2009) 37009
DOI: 10.1209/0295-5075/87/37009

Possible superconducting symmetry on the doped J1-J2 model investigated using the renormalized mean-field theory

Huai-Xiang Huang, Ying Jiang and Guo-Hong Yang

Department of Physics, Shanghai University - Shanghai, 200444, China

hxhuang@shu.edu.cn

received 15 January 2009; accepted in final form 27 July 2009; published August 2009
published online 28 August 2009

Abstract
By making use of the renormalized mean-field theory, we investigate possible superconducting symmetry in the ground states of the t1-t2-J1-J2 model on a square lattice. The superconducting symmetry of ground states is determined by the frustration amplitude t2/t1 and doping concentration. The phase diagram of this system in the frustration-doping plane is given. The amplitude of the pairing parameter on diagonal bonds increases with increasing value of t2/t1, and ground-state change from a conventional dx2-y2-wave state to a mixed state, ultimately to a dxy-wave state. The order of the phase transitions among these different symmetry states is discussed.

PACS
74.20.Rp - Pairing symmetries (other than s-wave).
74.25.Dw - Superconductivity phase diagrams.
74.20.Mn - Nonconventional mechanisms (spin fluctuations, polarons and bipolarons, resonating valence bond model, anyon mechanism, marginal Fermi liquid, Luttinger liquid, etc.).

© EPLA 2009