Impact of magnetic frustration on the Mott transition within a slave-boson mean-field theory

Imseok Yang, Ekkehard Lange, Gabriel Kotliar

Research output: Contribution to journalArticlepeer-review

13 Scopus citations

Abstract

We investigate the paramagnetic-metal-to-antiferromagnetic-metal and antiferromagnetic-metal-to-antiferromagnetic-insulator transitions using a slave-boson mean-field theory. To this effect, we discuss the ground state of the half-filled Hubbard model as a function of (Formula presented) and correlation strength U, where t and (Formula presented) are the hopping amplitudes between nearest and next-nearest neighbors, respectively. The metal-insulator transition at a critical (Formula presented) is of second order for small levels of magnetic frustration, (Formula presented) and of first order for large ones, (Formula presented) The insulator is always antiferromagnetically ordered, while the metal exhibits a second-order transition from a paramagnetic to an antiferromagnetic state up to (Formula presented) as U is increased. We also contrast these findings with what we obtain in Hartree-Fock approximation.

Original languageEnglish (US)
Pages (from-to)2521-2524
Number of pages4
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume61
Issue number4
DOIs
StatePublished - 2000

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

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