2005/03/28 by Michael Hinczewski, Hinczewski, Michael, A. Nihat Berker +1
Physics and Astronomy · #Atomic and Subatomic Physics Research #FOS: Physical sciences #Physics of Superconductivity and Magnetism #Quantum, superfluid, helium dynamics #Strongly Correlated Electrons (cond-mat.str-el) #cond-mat.str-el
paper · pdf · doi:10.48550/arxiv.cond-mat/0503631
11 pages, 6 figures
arxiv created 2005/03/28 · openalex publication_date 2005/03/28 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
The superfluid weight, free carrier density, and specific heat of the\nthree-dimensional tJ model are calculated by renormalization-group theory. We\nfind that optimal hole doping for superfluidity occurs in the electron density\nrange of ni approximately between 0.63 - 0.68, where the superfluid weight\nns/m* reaches a local maximum. This density range is within the novel tau\nphase, where the electron hopping strength renormalizes to infinity, the system\nremains partially filled at all length scales, and the electron-hopping\nexpectation value remains distinctively non-zero at all length scales. The\ncalculated superfluid weight drops off sharply in the overdoped region. Under\nhole doping, the calculated density of free carriers increases until optimal\ndoping and remains approximately constant in the overdoped region, as seen\nexperimentally in high-Tc materials. Furthermore, from calculation of the\nspecific heat coefficient gamma, we see clear evidence of a gap in the\nexcitation spectrum for the tau phase.\n