Paradoxical magnetic cooling in a structural transition model |
| |
| Authors: | P. Borrmann H. Stamerjohanns E.R. Hilf D. Tománek |
| |
| Affiliation: | (1) Department of Physics, Carl von Ossietzky University, 26111 Oldenburg, Germany, DE;(2) Department of Physics and Astronomy, Michigan State University, East Lansing, Michigan 48824-1116, USA, US |
| |
| 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. Received 5 September 2000 |
| |
| Keywords: | PACS. 05.70.Fh Phase transitions: general studies – 75.10.-b General theory and models of magnetic ordering – 75.50.Mm Magnetic liquids |
| 本文献已被 SpringerLink 等数据库收录！ |
|
