Details

Autor(en) / Beteiligte

• CHAPON, L. C
• BLAKE, G. R
• GUTMANN, M. J
• PARK, S
• HUR, N
• RADAELLI, P. G
• CHEONG, S.-W

Titel

Structural anomalies and multiferroic behavior in magnetically frustrated TbMn2O5

Ist Teil von

• Physical review letters, 2004-10, Vol.93 (17), p.177402.1-177402.4

Ort / Verlag

Ridge, NY: American Physical Society

Erscheinungsjahr

2004

Quelle

PROLA

Beschreibungen/Notizen

• 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.