| | |
| | |
Stat |
Members: 3645 Articles: 2'502'364 Articles rated: 2609
23 April 2024 |
|
| | | |
|
Article overview
| |
|
Spin glass freezing in Kondo lattice compounds | Alba Theumann
; B. Coqblin
; S. G. Magalhaes
; A. A. Schmidt
; | Date: |
13 Sep 2000 | Subject: | Statistical Mechanics; Disordered Systems and Neural Networks | cond-mat.stat-mech cond-mat.dis-nn | Affiliation: | Instituto de Fisica, UFGRS, Brazil), B. Coqblin (Laboratoire de Physique des Solides, Universite Paris - Sud, France), S. G. Magalhaes and A. A. Schmidt (Departamento de Matematica, UFSM, Brazil | Abstract: | It is presented a theory that describes a spin glass phase at finite temperatures in Kondo lattice systems with an additional RKKY interaction represented by long range, random couplings among localized spins like in the Sherrington- Kirkpatrick (SK) spin glass model. The problem is studied within the functional integral formalism where the spin operators are represented by bilinear combinations of fermionic (anticommuting) Grassmann variables. The Kondo and spin glass transitions are both described with the mean field like static ansatz that reproduces good results in the two well known limits. At high temperatures and low values of the Kondo coupling there is a paramagnetic (disordered) phase with vanishing Kondo and spin glass order parameters. By lowering the temperature a second order transition line is found at Tsg to a spin glass phase. For larger values of the Kondo coupling there is a second order transition line at roughly Tk to a Kondo ordered state. For T | Source: | arXiv, cond-mat/0009197 | Services: | Forum | Review | PDF | Favorites |
|
|
No review found.
Did you like this article?
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 Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)
|
| |
|
|
|
| News, job offers and information for researchers and scientists:
| |