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.
|ジャーナル||Physica C: Superconductivity and its applications|
|出版ステータス||Published - 2003 5|
|イベント||proceedings of the 23rd international conference on low temper - Hiroshima, Japan|
継続期間: 2002 8 20 → 2002 8 27
ASJC Scopus subject areas