Pseudogaps and magnetic properties of the two-dimensional t-J model

Simple item page
dc.creatorSherman, A.
dc.creatorSchreiber, M.
dc.date1998-08-08
dc.date.accessioned2026-07-07T03:11:16Z
dc.date.available2026-07-07T03:11:16Z
dc.descriptionWe apply the modified spin-wave theory with the constraint of zero staggered magnetization to investigate normal-state spectral and magnetic properties of the 2D t-J model in the paramagnetic state. A set of self-energy equations for hole and magnon Green's functions is solved numerically in the self-consistent Born approximation. The constraint can be fulfilled in the ranges of hole concentrations 0.02 < x < 0.17 and temperatures T < 150 K. In this region the hole spectrum differs from a conventional metallic spectrum which is manifested in the variation with x of the quasiparticle weights of states and in the violation of Luttinger's theorem. With decreasing x from x = 0.17 hidden parts appear in the hole Fermi surface which can be interpreted as the opening of a pseudogap near (pi,0). Obtained size, symmetry and concentration dependence of the pseudogap are in agreement with photoemission data in Bi2212. Calculated temperature dependencies of the spin correlation length, spin-lattice relaxation times at the Cu and O sites, and static susceptibility are typical for the quantum disordered regime with a pseudogap in the spectrum of magnetic excitations. These quantities are in qualitative and in some cases in quantitative agreement with experiment in underdoped YBa2Cu3O(6+y). At x > 0.12 the considered phase borders the phase of conventional metal.
dc.description25 pages, 12 Postscript figures, uses psfig.sty
dc.identifierhttps://arxiv.org/abs/cond-mat/9808087
dc.identifierhttp://arxiv.org/abs/cond-mat/9808087
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/28507
dc.subjectStrongly Correlated Electrons
dc.subjectSuperconductivity
dc.titlePseudogaps and magnetic properties of the two-dimensional t-J model
dc.typetext

Files

Collections

arXiv