Science-advisor
REGISTER info/FAQ
Login
username
password
     
forgot password?
register here
 
Research articles
  search articles
  reviews guidelines
  reviews
  articles index
My Pages
my alerts
  my messages
  my reviews
  my favorites
 
 
Stat
Members: 3643
Articles: 2'488'730
Articles rated: 2609

29 March 2024
 
  » arxiv » cond-mat/9809368

 Article overview


Bruekner approach to the spin-wave gap critical index for the two-layer Heisenberg antiferromagnet
P.V.Shevchenko ; O.P.Sushkov ;
Date 28 Sep 1998
Journal Phys. Rev. B 59, 8383 (1999)
Subject Statistical Mechanics; Superconductivity | cond-mat.stat-mech cond-mat.supr-con
AbstractWe consider the two-layer Heisenberg antiferromagnet near a zero temperature quantum phase transition from a disordered dimer phase to a collinear Neel state. At approaching the transition point the spin-wave gap vanishes as $Delta propto (J_perp-J_{perp c})^{ u}$. To account for strong correlations between the S=1 elementary excitations we apply the Brueckner diagram approach which gives the critical index $ uapprox 0.5$. We demonstrate also that the linearized in density Brueckner equations give the mean field result $ u=1$. Finally an expansion of the Brueckner equations in powers of the density, combined with the scaling hypothesis, give $ uapprox 0.67$. This value reasonably agrees with that of the nonlinear O(3) $sigma$-model. Our approach demonstrates that for other quantum spin models the critical index can be different from that in the nonlinear $sigma$-model. We discuss the conditions for this to occur.
Source arXiv, cond-mat/9809368
Services Forum | Review | PDF | Favorites   
 
Visitor rating: did you like this article? no 1   2   3   4   5   yes

No review found.
 Did you like this article?

This article or document is ...
important:
of broad interest:
readable:
new:
correct:
Global appreciation:

  Note: answers to reviews or questions about the article must be posted in the forum section.
Authors are not allowed to review their own article. They can use the forum section.

browser claudebot






ScienXe.org
» my Online CV
» Free


News, job offers and information for researchers and scientists:
home  |  contact  |  terms of use  |  sitemap
Copyright © 2005-2024 - Scimetrica