Eur. Phys. J. B (2013) 86: 108
https://doi.org/10.1140/epjb/e2013-31057-9

Regular Article

Superconducting pairing symmetry in frustrating t-J model: Electronic Raman absorption

¹ School of Physics and Electronic Information, Huaibei Normal University, Huaibei 235000, P.R. China
² Department of Physics, University of California, San Diego, La Jolla, 92093 California, USA
³ Department of Mathematics and Information Science, North China Institute of Water Conservancy and Hydroelectric Power, Zhengzhou 450011, P.R. China

^a e-mail: luhongyan2006@gmail.com

Received: 21 November 2012
Received in final form: 8 January 2013
Published online: 20 March 2013

Abstract

Motivated by the controversy on the pairing symmetry of layered organic superconductors, we study electronic Raman scattering spectra on a frustrating lattice. A two-dimensional t-t′-J-J′ model and the Gutzwiller projectional variational method is used. The pairing symmetry is obtained self-consistently. Basing on this, we perform a systematic investigation of the density of states and electronic Raman spectra as a function of t′/t: ranging from t′ = 0, the square lattice model, to t′ = t, the isotropic triangular lattice model. We discuss the polarization dependence of the Raman spectra, which could be used to identify the relevant superconducting pairing symmetry of frustrating systems such as layered organic superconductors.