2002/12/18 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/0212436
5 pages, 5 figures
arxiv created 2002/12/18 · arxiv updated 2009/11/30
Based on our improved SU(2) slave-boson approach (Phys. Rev. B 64, 052501(2001)) to the t-J Hamiltonian, we report a scaling behavior of pseudogap with doping and the temperature and doping dependence of spectral functions. In addition we discuss the cause of hump and quasi-particle peak in the observed spectral functions of high Tc cuprates. It is demonstrated that the sharpening of the observed quasi-particle peak below Tc is attributed to the bose condensation of holon pair. From the computed ratios of pseudogap Δ0 to both the superconducting temperature Tc and the pseudogap temperature T^* as a function of hole doping concentration x, we find that there exists a universal scaling of these ratios with doping, that is, the hyperbolic scaling behavior of the former, (2 Δ0)/(kB Tc) ∼ x-α with α∼ 2 and near doping independence of the latter, (2 Δ0)/(kB T^*) ≈ 4 ∼ 6 are found.