2000/05/06 by Sung-Sik Lee, Lee, Sung-Sik, Sung-Ho Suck Salk +1
Physics and Astronomy · #FOS: Physical sciences #Strongly Correlated Electrons (cond-mat.str-el) #Superconductivity (cond-mat.supr-con) #cond-mat.str-el #cond-mat.supr-con
paper · pdf · doi:10.48550/arxiv.cond-mat/0005120
arxiv created 2000/05/06 · arxiv updated 2009/11/30
Based on an improved U(1) slave-boson approach to the t-J Hamiltonian, we invest igate a relationship between the superfluid weight ns/m^*(the superconducting charge carrier density/the effective mass of the charge carrier) and the superc onducting temperature Tc. From the present study we find a linear increase of ns/m^* with Tc with th e doping concentration in the underdoped region, a saturation around the optimal doping and a decrease in both ns/m^* and Tc in the overdoped region. Such a trend of the `boomerang' shaped locus in ns/m^* vs. Tc with increas ing doping concentration from the underdoped to the heavily overdoped region is predicted to be in complete agreement with muon-spin-relaxation measurements. The boomerang behavior is found to occur in correlation with reduction in the sp in singlet pairing(spinon pairing) order in the heavily overdoped region.