2009/08/31 by Jakub Jȩdrak, Jozef Spałek · 1 citation
Physics and Astronomy · #cond-mat.str-el #cond-mat.stat-mech
paper · pdf · doi:10.1103/physrevb.81.073108
published as Phys. Rev. B 81, 073108 (2010) · 5 pages, 4 figures, 2 tables. Minor typos have been fixed to make this version compatible with that published in Phys. Rev. B.
arxiv created 2010/04/24 · arxiv updated 2015/05/14
A variational treatment of the Gutzwiller - renormalized t-J Hamiltonian combined with the mean-field (MF) approximation is proposed, with a simultaneous inclusion of additional consistency conditions. Those conditions guarantee that the averages calculated variationally represent true mean-field expectation values. This is not ensured a priori when the effective Hamiltonian contains renormalization factors which depend on the mean-field averages. A comparison with previous mean-field treatments is made for both superconducting (d-RVB) and normal states and encompasses calculations of both the superconducting gap and the renormalized hopping amplitudes, as well as the electronic structure. The C4v-symmetry breaking in the normal phase - the Pomeranchuk instability (PI) - is also analyzed.