SrCu_2(BO_3)_2 – a Two Dimensional Spin Liquid

Дата и время публикации : 2000-09-26T17:26:38Z

Авторы публикации и институты :
Christian Knetter
Alexander Buehler
Erwin Mueller-Hartmann
Goetz S. Uhrig

Ссылка на журнал-издание: Can. J. Phys. 79, 1565 (2001)
Коментарии к cтатье: 4 pages, 3 figures, Proceeding paper of the HFM2000 conference in Waterloo, Canada, Jun 2000
Первичная категория: cond-mat.str-el

Все категории : cond-mat.str-el

Краткий обзор статьи: We study an extended Shastry-Sutherland model for SrCu_2(BO_3)_2 and analyze the low lying parts of the energy spectrum by means of a perturbative unitary transformation based on flow equations. The derivation of the 1-magnon dispersion (elementary triplets) is discussed. Additionally, we give a quantitative description (symmetries and energies) of bound states made from two elementary triplets. Our high order results allow to fix the model parameters for SrCu_2(BO_3)_2 precisely: J_1=6.16(10)meV, x:=J_2/J_1=0.603(3), J_perp=1.3(2)meV. To our knowledge this is the first quantitative treatment of bound states in a true 2d model.

Category: Physics