Structural change in single crystal induced by magnetic field

P. Svoboda; M. Doerr; M. Loewenhaupt; M. Rotter; T. Reif; F. Bourdarot; P. Burlet

doi:10.1209/epl/i1999-00498-4

All issues

Volume 48 / No 4 (November II 1999)

Europhys. Lett., 48 4 (1999) 410-414

Abstract

Issue		Europhys. Lett. Volume 48, Number 4, November II 1999


Page(s)		410 - 414
Section		Condensed matter: structure, mechanical and thermal properties
DOI		https://doi.org/10.1209/epl/i1999-00498-4
Published online		01 September 2002

Europhys. Lett., 48 (4), pp. 410-414 (1999)

Structural change in $\rm DyCu_2$ single crystal induced by magnetic field

P. Svoboda¹, M. Doerr², M. Loewenhaupt², M. Rotter², T. Reif³, F. Bourdarot⁴ and P. Burlet⁴

¹ 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

Received: 19 July 1999
Accepted: 15 September 1999

Abstract

The metamagnetic transition in the orthorhombic antiferromagnets $\rm RCu_2$ (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) $\Delta L/L \ge 1$ % is observed at the conversion. Neutron scattering experiments on a $\rm DyCu_2$ single crystal reveal that this axis conversion is also connected with a structural transition from the orthorhombic $\rm CeCu_2$ -type structure to the hexagonal $\rm AlB_2$ -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

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