Bond-Operator Mean Field Theory for the Bilayer Heisenberg Model

Дата и время публикации : 1998-08-05T11:08:03Z

Авторы публикации и институты :
Yasuhiro Matsushita (Science Univ. of Tokyo)
Martin P. Gelfand (Colorado State Univ)
Chikara Ishii (Science Univ. of Tokyo)

Ссылка на журнал-издание: J. Phys. Soc. Jpn., 68 (1999) 247
Коментарии к cтатье: 10 pages, LaTeX, 8 figures, uses jpsj.sty, revised version: minor changes to the text, to appear in J. Phys. Soc. Jpn. Vol.68 No.1 (January 1999)
Первичная категория: cond-mat.str-el

Все категории : cond-mat.str-el

Краткий обзор статьи: Bond-operator mean field equations for the square-lattice, S=1/2 bilayer Heisenberg model are developed and solved numerically. In the vicinity of both the zero-field critical point and the field-induced transitions, comparisons are made with T=0 and finite-temperature strong coupling expansions. The mean-field theory suggests that the quantum critical region for the field-induced transitions is restricted to significantly lower temperatures than one might have concluded based on strong-coupling expansions or other numerical studies.

Category: Physics