ar X iv : c on d - m at / 9 50 90 04 v 1 1 S ep 1 99 5 2 - Dimensional Electron Gas in a Linearly Varying Magnetic Field

ar X iv : c on d - m at / 9 70 91 11 v 1 9 S ep 1 99 7 Specific Heat of defects in the Haldane System

We calculate the specific heat of the antiferromagnetic spin-1 chain compound Y 2 BaNi 1−x Zn x O 5 in the presence of a magnetic field. The low-energy spectrum of a Heisenberg Hamiltonian, which includes realistic anisotropies, has been solved using the density matrix renormalization group. The observed Schottky anomaly is very well described by this theory. For large chains (N > 50), contrary...

ar X iv : c on d - m at / 9 90 90 44 v 1 3 S ep 1 99 9 Systematic low temperature expansion in Ginzburg - Landau model

Consistent perturbation theory for thermodynamical quantities in strongly type II superconductors in magnetic field at low temperatures is developed. It is complementary to the existing expansion valid at high temperatures. Magnetization and specific heat are calculated to two loop order and compare well with existing Monte Carlo simulations, other theories and experiments. Typeset using REVTEX 1

ar X iv : c on d - m at / 9 80 90 76 v 1 3 S ep 1 99 8 Correlations in the impenetrable electron gas

We consider non-relativistic electrons in one dimension with infinitely strong repulsive delta function interaction. We calculate the long-time, large-distance asymptotics of field-field correlators in the gas phase. The gas phase at low temperatures is characterized by the ideal gas law. We calculate the exponential decay, the power law corrections and the constant factor of the asymptotics. O...

ar X iv : c on d - m at / 9 60 50 49 v 2 9 M ay 1 99 6 Gap probability of a one - dimensional gas model

We investigate the gap formation probability of the effective one dimensional gas model recently proposed for the energy level statistics for disordered solids at the mobility edge. It is found that in order to get the correct form for the gap probability of this model, the thermodynamic limit must be taken very carefully. † [email protected] †† [email protected] To appear in the In...

ar X iv : c on d - m at / 9 60 31 90 v 1 2 9 M ar 1 99 6 The Four - Dimensional XY Spin Glass