ar X iv : 0 80 1 . 14 20 v 1 [ co nd - m at . s ta t - m ec h ] 9 J an 2 00 8 Order parameters in the Verwey phase transition

ar X iv : c on d - m at / 0 20 91 97 v 1 [ co nd - m at . s up r - co n ] 9 S ep 2 00 2 Oxygen Phonon Branches

ar X iv : 0 90 3 . 48 68 v 1 [ co nd - m at . s ta t - m ec h ] 2 7 M ar 2 00 9 Damage in impact fragmentation

Using a simple and generic molecular dynamics model, we study the damage in a disk of interacting particles as the disc fragments upon impact with a wall. The damage, defined as the ratio of the number of bonds broken by the impact to the initial number of bonds, is found to increase logarithmically with the energy deposited in the system. This result implies a linear growth with damage for the...

ar X iv : 0 80 2 . 14 22 v 2 [ co nd - m at . s of t ] 1 6 A ug 2 00 8 Critical Swelling of Particle - Encapsulating Vesicles

We consider a ubiquitous scenario where a fluctuating, semipermeable vesicle is embedded in solution while enclosing a fixed number of solute particles. The swelling with increasing number of particles or decreasing concentration of the outer solution exhibits a continuous phase transition from a fluctuating state to the maximum-volume configuration, whereupon appreciable pressure difference an...

ar X iv : c on d - m at / 0 10 90 27 v 1 [ co nd - m at . s tr - e l ] 3 S ep 2 00 1 The Net Spin Model

We study a set of exactly soluble spin models in one and two dimensions for any spin S. Its ground state, the excitation spectrum, quantum phase transition points, as well as dimensional crossover are determined.

ar X iv : 0 80 3 . 27 76 v 1 [ co nd - m at . s up r - co n ] 1 9 M ar 2 00 8 Negative conductance in driven Josephson junctions ∗

We investigate an optimal regime of negative-valued conductance, emerging in a resistively and capacitively shunted Josephson junction, which is driven simultaneously by both, a time-periodic (ac) and a constant (dc) current. We analyze the current-voltage characteristics in the regime of absolute negative conductance. We additionally explore the stability of the negative response with respect ...