One-dimensional spin-1/2 Heisenberg antiferromagnet in a weak external magnetic field

Дата и время публикации : 2000-02-07T22:25:59Z

Авторы публикации и институты :
Ping Sun
D. Schmeltzer

Ссылка на журнал-издание: Phys. Rev. B61, 349 (2000)
Коментарии к cтатье: 5 pages, 1 figure, published on PRB
Первичная категория: cond-mat.str-el

Все категории : cond-mat.str-el

Краткий обзор статьи: The one dimensional spin-1/2 Heisenberg antiferromagnet in a weak magnetic field h is studied using the bosonization method. We derive a set of renormalization group equations. The fixed point is reached when the field is scaled to the value at which the system is quarter-filled. As the magnetic field varies, a continuum line of fixed points is formed. We compute the uniform longitudinal susceptibility $chi_z(h)$. The singular behavior of $chi_z(h)$ as $hto 0$ is found to be contained in $1/ln(h_o/h)$ with $h_o$ a non-universal constant. The spin-spin correlations in the magnetic field are calculated.

Category: Physics