Paradoxical Magnetic Cooling in a Structural Transition Model

Details Paradoxical Magnetic Cooling in a Structural Transition Model Paradoxical Magnetic Cooling in a Structural Transition Model

2000-09-04

arxiv.org/abs/cond-mat/0009048v2

European Physical Journal B 19, 117-119 (2001)

Physics

Condensed Matter

Statistical Mechanics

3 pages, 2 figures. For recent information on physics of small systems see http://www.smallsystems.de

Scientific paper

10.1007/s100510170356

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.

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