Comment on the mean-field phase diagram of the spin-1 Ising model in a random crystal field

1989 ◽  
Vol 1 (23) ◽  
pp. 3687-3689 ◽  
Author(s):  
C E I Carneiro ◽  
V B Henriques ◽  
S R Salinas
Keyword(s):  
Phase Diagram ◽  
Ising Model ◽  
Crystal Field ◽  
Mean Field ◽  
Field Phase ◽  
The Mean

η-PAIRING SUPERCONDUCTIVITY IN THE NEGATIVE-U HUBBARD MODEL: EFFECT OF FLUCTUATIONS AND DISORDER

1994 ◽  
Vol 08 (15) ◽  
pp. 2041-2058
Author(s):  
JÜRGEN STEIN
Keyword(s):  
Phase Diagram ◽  
Asymptotic Expansion ◽  
Hubbard Model ◽  
Strong Coupling ◽  
Mean Field ◽  
Higher Order ◽  
Field Phase ◽  
Effective Pair ◽  
The Mean ◽  
Pair Hopping

We have studied the influence of singular fluctuations around the mean-field solution as well as higher order contributions to the geometry controlled asymptotic expansion of the propagators on η-pairing superconductivity in the strong coupling negative-U Hubbard model in the presence of unpaired electrons. The modifications of the mean-field results due to the introduction of disorder and allowance for finite U are also calculated. Besides the singularities already present in the O(2) nonlinear σ-model we find a filling-depending singular depression of the repulsive effective pair-hopping interaction which strongly alters the mean-field phase diagram and appears to suppress the η-pairing phase near the band edges.

Harmonic corrections to the mean‐field phase diagram for block copolymers

1994 ◽  
Vol 100 (9) ◽  
pp. 6813-6817 ◽  
Author(s):  
Ian W. Hamley ◽  
Frank S. Bates
Keyword(s):  
Phase Diagram ◽  
Block Copolymers ◽  
Mean Field ◽  
Field Phase ◽  
The Mean

Phase Diagram of the Semi-Infinite Ising Model in a Random Field

1997 ◽  
Vol 11 (21n22) ◽  
pp. 973-979 ◽  
Author(s):  
A. S. de Arruda ◽  
W. Figueiredo
Keyword(s):  
Phase Diagram ◽  
Renormalization Group ◽  
Ising Model ◽  
Random Field ◽  
Random Fields ◽  
Mean Field ◽  
Cubic Lattice ◽  
The Mean ◽  
Tricritical Behavior ◽  
Field Renormalization

We determine the phase diagram of the semi-infinite Ising model in a cubic lattice with a trimodal distribution of random fields on the surface. We use the mean-field renormalization group with the smallest possible clusters to show that a very small dilution of the random field at surface is sufficient to destroy the tricritical behavior.

Mean-field phase diagram of cold lattice bosons in disordered potentials

2007 ◽  
Vol 76 (1) ◽  
Author(s):  
P. Buonsante ◽  
V. Penna ◽  
A. Vezzani ◽  
P. B. Blakie
Keyword(s):  
Phase Diagram ◽  
Mean Field ◽  
Field Phase
Sign in / Sign up

Export Citation Format

Share Document