Paradoxical Magnetic Cooling in a Structural Transition Model
Statistical Mechanics
2009-10-31 v2
Abstract
In contrast to the experimentally widely used isentropic demagnetization process for cooling to ultra-low temperatures we examine a particular classical model system that does not cool, but rather heats up with isentropic demagnetization. This system consists of several magnetite particles in a colloidal suspension, and shows the uncommon behavior of disordering structurally while ordering magnetically in an increasing magnetic field. For a six-particle system, we report an uncommon structural transition from a ring to a chain as a function of magnetic field and temperature.
Cite
@article{arxiv.cond-mat/0009048,
title = {Paradoxical Magnetic Cooling in a Structural Transition Model},
author = {Peter Borrmann and Heinrich Stamerjohanns and Eberhard R. Hilf and David Tomanek},
journal= {arXiv preprint arXiv:cond-mat/0009048},
year = {2009}
}
Comments
3 pages, 2 figures. For recent information on physics of small systems see http://www.smallsystems.de