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cond-mat1994
Competition of Phonons and Magnetic Interaction in One-Dimensional Fermion Systems
D. Braak, F. Sievers, K. Ziegler
We consider a system of spin-dependent fermions on a one-dimensional lattice which is coupled to phonons. The phonons create either a Peierls instability by breaking the translatio…
cond-mat1993
Spontaneous Magnetization in the Disorder dominated Phase of the Twodimensional Random Bond Ising Model
D. Braak
The selfconsistent approach to the 2D Ising Model with quenched random bonds is extended to the full lattice theory of four real fermions. The additional degrees of freedom, neglec…