Details

Autor(en) / Beteiligte

• Sławiński, W.
• Przeniosło, R.
• Sosnowska, I.
• Petříček, V.

Titel

Helical screw type magnetic structure of the multiferroic CaMn 7 O 12 with low Cu-doping

Ist Teil von

• Acta crystallographica. Section B, Structural science, 2012-06, Vol.68 (3), p.240-249

Erscheinungsjahr

2012

Link zum Volltext

Quelle

Wiley Blackwell Single Titles

Beschreibungen/Notizen

• The modulated crystal structure and modulated magnetic ordering of the multiferroic CaCu x Mn 7− x O 12 is studied by analysing neutron and synchrotron-radiation (SR) powder diffraction data with a model based on the magnetic superspace group R 31′(00γ) ts . Both atomic position modulations and magnetic modulations are described with the modulation vector (0, 0, q ). The magnetic ordering is a screw-type circular helix where the magnetic moments are perpendicular to the c direction. The temperature dependence of the modulation vector length and the ordered magnetic moments of Mn 3+ and Mn 4+ ions is given between T  = 50 K and the Néel temperature T N ≃ 90 K. The atomic position modulation length L p and the magnetic modulation length L m fulfil the relation L m  = 2 L p at all temperatures between 50 K and T N .