Incommensurate spiral magnetic order on anisotropic triangular lattice: Dynamical mean-field study in a spin-rotating frame

Shimpei Goto, Susumu Kurihara, Daisuke Yamamoto

Research output: Contribution to journalArticle

3 Citations (Scopus)

Abstract

We study the ground-state magnetism of the half-filled Hubbard model on the anisotropic triangular lattice, where two out of three bonds have hopping t and the third one has t′ in a unit triangle. Working in a spin-rotating frame and using the density matrix renormalization group method as an impurity solver, we provide a proper description of incommensurate magnetizations at zero temperature in the framework of the dynamical mean-field theory (DMFT). It is shown that the incommensurate spiral magnetic order for t′/t0.7 survives the dynamical fluctuations of itinerant electrons in the Hubbard interaction range from the strong-coupling (localized-spin) limit down to the insulator-to-metal transition. We also find that when the anisotropy parameter t′/t increases from the Néel-to-spiral transition, the magnitude of the magnetic moment exhibits a maximum at the isotropic triangular lattice point t′/t=1 and then rapidly decreases in the range of larger t′/t. This work gives a solid foundation for further extension of the study including nonlocal correlation effects neglected at the standard DMFT level.

Original languageEnglish
Article number245145
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume94
Issue number24
DOIs
Publication statusPublished - 2016 Dec 28

Fingerprint

Mean field theory
Hubbard model
renormalization group methods
Magnetism
Magnetic moments
triangles
Ground state
Transition metals
Magnetization
Anisotropy
magnetic moments
transition metals
insulators
Impurities
impurities
magnetization
anisotropy
ground state
Electrons
electrons

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Incommensurate spiral magnetic order on anisotropic triangular lattice : Dynamical mean-field study in a spin-rotating frame. / Goto, Shimpei; Kurihara, Susumu; Yamamoto, Daisuke.

In: Physical Review B - Condensed Matter and Materials Physics, Vol. 94, No. 24, 245145, 28.12.2016.

Research output: Contribution to journalArticle

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