Volume 48, Number 4, November II 1999
|Page(s)||410 - 414|
|Section||Condensed matter: structure, mechanical and thermal properties|
|Published online||01 September 2002|
Structural change in single crystal induced by magnetic field
Department of Electronic Structures, Charles University Ke Karlovu 5, 12116 Praha 2, Czech Republic
2 Institut für Angewandte Physik (IAPD) - TU Dresden, 01062 Dresden, Germany
3 Institut für Festkörperforschung, Forschungszentrum Jülich - 52425 Jülich, Germany
4 CEA, Département de Recherche Fondamentale sur la Matiére Condensée SPSMS/MDN, 38054 Grenoble, France
Accepted: 15 September 1999
The metamagnetic transition in the orthorhombic antiferromagnets (R=Ce, Pr, Dy, Tb) in high magnetic fields parallel to the c-direction is connected with a conversion of the magnetic Ising axis from the orthorhombic a- to the c-direction. The new state remains stable even after switching off the field. A giant magnetostriction (GMS) % is observed at the conversion. Neutron scattering experiments on a single crystal reveal that this axis conversion is also connected with a structural transition from the orthorhombic -type structure to the hexagonal -type structure due to strong magnetoelastic coupling. To our knowledge this is the first observation of a change from low to high crystal lattice symmetry by application of an external magnetic field.
PACS: 64.60.-i – General studies of phase transitions
© EDP Sciences, 1999
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