Structural anomalies and multiferroic behavior in magnetically frustrated TbMn2O5 |
| |
Authors: | Chapon L C Blake G R Gutmann M J Park S Hur N Radaelli P G Cheong S-W |
| |
Affiliation: | ISIS Facility, Rutherford Appleton Laboratory-CCLRC, Chilton, Didcot, Oxfordshire, OX11 0QX, United Kingdom. |
| |
Abstract: | We have studied the magnetostructural phase diagram of multiferroic TbMn2O5 as a function of temperature and magnetic field by neutron diffraction. Dielectric and magnetic anomalies are found to be associated with steps in the magnetic propagation vector, including a rare example of a commensurate-incommensurate transition on cooling below 24 K, and in the structural parameters. The geometrically frustrated magnetic structure is stabilized by "canted antiferroelectric" displacements of the Mn3+ ions, an example of the magnetic Jahn-Teller effect. The Tb moments order ferromagnetically at low temperatures in an applied field, while the Mn magnetic structure is largely unchanged. |
| |
Keywords: | |
本文献已被 PubMed 等数据库收录! |
|