Orbital-selective phase transition induced by different magnetic states: A dynamical cluster approximation study

Hunpyo Lee, Yu Zhong Zhang, Harald Olaf Jeschke, Roser Valentí

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

Motivated by the unexplored complexity of phases present in the multiorbital Hubbard model, we analyze in this work the behavior of a degenerate two-orbital anisotropic Hubbard model at half-filling where both orbitals have equal bandwidths and one orbital is constrained to be paramagnetic (PM), while the second one is allowed to have an antiferromagnetic (AF) solution. Such a model may be relevant for a large class of correlated materials with competing magnetic states in different orbitals such as the recently discovered Fe-based superconductors. Using a dynamical cluster approximation we observe that unique orbital selective phase transitions appear regardless of the strength of the Ising Hund's rule coupling Jz. Moreover, the PM orbital undergoes a transition from a Fermi liquid (FL) to a Mott insulator through a non-FL phase while the AF orbital shows a transition from a FL to an AF insulator through an AF metallic phase. We discuss the implications of the results in the context of the Fe-based superconductors.

Original languageEnglish
Article number020401
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume84
Issue number2
DOIs
Publication statusPublished - Jul 7 2011
Externally publishedYes

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Fermi liquids
Hubbard model
Phase transitions
orbitals
approximation
Bandwidth
Liquids
insulators
Iron-based Superconductors
liquid phases
bandwidth

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

Orbital-selective phase transition induced by different magnetic states : A dynamical cluster approximation study. / Lee, Hunpyo; Zhang, Yu Zhong; Jeschke, Harald Olaf; Valentí, Roser.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 84, No. 2, 020401, 07.07.2011.

Research output: Contribution to journalArticle

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