Effect of a geometrical frustration in the doped Mott insulator

Takashi Koretsune, Masao Ogata

Research output: Contribution to journalConference articlepeer-review


The two-dimensional t-J model on the triangular lattice has been studied using high-temperature expansions. By calculating the entropy and the spin-spin correlation function through twelfth order in inverse temperature, we revealed that hole doping favors a nearest-neighbor singlet formation, indicating that the resonating valence bond state is stabilized in low temperatures. On the contrary, with electron doping, we find that there exists a wide ferromagnetic region in the phase diagram, which is related to the Nagaoka's ferromagnetism, the flat band ferromagnetism and the Kanamori's ferromagnetism. It is also found that the competition between this ferromagnetic behavior and the antiferromagnetic coupling results in the large effective mass near half filling.

Original languageEnglish
Pages (from-to)88-89
Number of pages2
JournalPhysica C: Superconductivity and its applications
Publication statusPublished - 2003 May
Externally publishedYes
Eventproceedings of the 23rd international conference on low temper - Hiroshima, Japan
Duration: 2002 Aug 202002 Aug 27


  • Ferromagnetism
  • Frustration
  • Resonating valence bond

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering


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