Paradoxical magnetic cooling in a structural transition model
| Autor: | Peter Borrmann, Heinrich Stamerjohanns, David Tománek, Eberhard R. Hilf |
|---|---|
| Rok vydání: | 2001 |
| Předmět: |
Materials science
Statistical Mechanics (cond-mat.stat-mech) Condensed matter physics Isentropic process Demagnetizing field FOS: Physical sciences equipment and supplies Condensed Matter Physics Ring (chemistry) Electronic Optical and Magnetic Materials Magnetic field Colloid chemistry.chemical_compound chemistry Magnetic refrigeration Structural transition human activities Condensed Matter - Statistical Mechanics Magnetite |
| Zdroj: | ResearcherID |
| ISSN: | 1434-6028 |
| DOI: | 10.1007/s100510170356 |
| Popis: | 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. Comment: 3 pages, 2 figures. For recent information on physics of small systems see http://www.smallsystems.de |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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