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: 2'487'895
Articles rated: 2609

29 March 2024
 
  » arxiv » cond-mat/0405618

 Article overview


Magnetic droplets in a metal close to a ferromagnetic quantum critical point
Y.L.Loh ; V.Tripathi ; M.Turlakov ;
Date 26 May 2004
Journal Physical Review B 71, 024429 (2005) DOI: 10.1103/PhysRevB.71.024429
Subject Strongly Correlated Electrons | cond-mat.str-el
AbstractUsing analytical and path integral Monte Carlo methods, we study the susceptibility $chi_{dc}(T)$ of a spin-S impurity with XY rotational symmetry embedded in a metal. Close to a ferromagnetic quantum critical point, the impurity polarizes conduction electrons in its vicinity and forms a large magnetic droplet with moment M>>S. At not too low temperatures, the strongly damping paramagnon modes of the conduction electrons suppress large quantum fluctuations (or spin flips) of this droplet. We show that the susceptibility follows the law $chi_{dc}(T)=(M^{2}/T)[1-(pi g)^{-1}ln(gE_{0}/T)]$, where the parameter g>>1 describes the strong damping by conduction electrons, and E_0 is the bandwidth of paramagnon modes. At exponentially low temperatures T << T_{*} ~ E_{0}exp(-pi g/2) we show that spin flips cannot be ignored. In this regime we find that $chi_{dc}(T) approx chi_{dc}(0) [1-(2/3)(T/T_{*})^2]$, where $chi_{dc}(0)sim M^{2}/T_{*}$ is finite and exponentially large in g. We also discuss these effects in the context of the multi-channel Kondo impurity model.
Source arXiv, cond-mat/0405618
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