|
| | | | |
| | | |
| Stat |
Members: 3665
Articles: 2'599'751
Articles rated: 2609
19 January 2025 |
|
| | | | |
|
Article overview
| |
|
|
Generalized spin density wave state of the Hubbard model on the C12 and C60 clusters | | L. Bergomi
; J. P. Blaizot
; Th. Jolicoeur
; E. Dagotto
; | | Date: |
14 Oct 1992 | | Subject: | cond-mat | | Abstract: | The one-band Hubbard model at half-filling on a truncated tetrahedron (C$_{12}$), and on the C$_{60}$ molecule is studied. Within the Hartree-Fock approximation, we find a magnetic-like instability of the `Fermi sea’ towards a spin-ordered phase for an intermediate value of the coupling ${
m (U/t)_c}approx 2.6$. The ordered phase presents a spin arrangement similar to that of the classical Heisenberg model defined on the same clusters. We study the linear excitations around the Hartree-Fock ground states using the random-phase approximation. On a finite cluster, we expect that these results signal the presence of a $rapid$ $crossover$ between a paramagnetic region and a regime where spin correlations are important. The relationship with the Heisenberg limit (large ${
m U/t}$) is discussed. Finally, we comment on implications of our results for purely repulsive models of superconductivity in alkali-metal-doped fullerenes. | | Source: | arXiv, cond-mat/9210011 | | 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.
|
| |
|
|
|
REGISTER